When should I get a scan?

You should get a scan when the answer would change your treatment, follow-up plan, or prevention strategy. If the next step would be the same whether the scan is positive or negative, the scan usually is not adding value.

What is the difference between a CT and an MRI?

CT uses X-ray and is fast and excellent for bone, lung, acute bleeding, and coronary arteries. MRI uses magnetic fields and is excellent for soft tissue, brain, spine, joints, and cardiac muscle. CT involves radiation; MRI does not. Speed, cost, and what you are looking for all factor in.

Should I get a full-body MRI for screening?

For most average-risk adults, no. Whole-body MRI in healthy people finds an incidental abnormality in 30 to 60 percent of cases and a true early cancer in about 1 to 2 percent. The scan is most useful for patients with specific genetic risk, a strong family history, prior cancer, or unexplained symptoms a standard workup has not solved.

Is a calcium score enough for cardiovascular risk?

A calcium score is a useful starting point, but it only sees old, hardened plaque. Most heart attacks happen in soft plaque that has not calcified yet. For higher-risk patients, coronary CT angiography (CCTA) with plaque analysis sees both calcified and soft plaque and is a more complete picture.

Why not scan everything to be safe?

Scanning everything is not safer. Incidental findings drive follow-up scans, biopsies, and anxiety, with measurable costs and no outcome benefit at the population level. Selective, question-driven imaging gives better answers with less harm.

How long does it take to get an imaging report back?

Most CT and MRI reports return within 24 to 72 hours. Echocardiogram and ultrasound reports often return the same day or next business day. Specialty scans like Cleerly plaque analysis or Galleri liquid biopsy take 1 to 4 weeks.

Will my insurance cover the scan?

Insurance usually covers imaging with a clear clinical indication, like documented symptoms or abnormal labs. Calcium scores are often self-pay (around 100 dollars). Coronary CTA and MRI usually need prior authorization, which our team handles. Boutique full-body scans like Prenuvo are usually self-pay.

How do I know if I really need a repeat scan?

You need a repeat scan when guidelines call for it or a new clinical question changes the picture. Repeat scans for the same benign finding on an anxious cadence almost never change the plan. We follow published surveillance guidelines and avoid repeat imaging that adds anxiety without information.

How does Cleerly AI change cardiovascular imaging?

Cleerly AI turns a subjective radiologist read into a quantitative, reproducible measurement of plaque burden, type, and distribution. Instead of "moderate plaque," you get an exact volume by plaque category. That precision lets us track regression on therapy and decide whether to escalate medication or lifestyle changes.

What is the incidentaloma rate and why does it matter so much?

The incidentaloma rate on whole-body MRI is 30 to 60 percent in healthy adults, and nearly all of those findings are benign. Each one still triggers follow-up imaging, biopsies, or surveillance that carries time, dollar, and psychological costs. At population scale, the cumulative harm from those workups is the strongest argument for selective imaging.

How do you sequence labs and imaging?

We sequence labs first, then imaging only when labs and clinical context warrant it. ApoB, Lp(a), fasting insulin, hsCRP, and a careful history usually tell us where to look. An elevated ApoB plus family history pushes us toward CCTA; a clear panel often makes a deep scan unnecessary.

When is liquid biopsy preferable to imaging?

Liquid biopsy (Galleri and similar) is often preferable to whole-body imaging when the question is "is there a hidden cancer signal?" without a specific organ in mind. It has a lower incidentaloma burden and can detect signals from cancers MRI struggles with (gastric, colorectal, head and neck). It is often paired with targeted imaging rather than replaced by it.

How do you handle a small finding on a scan, like a 4 mm cyst?

We handle small findings by following published surveillance guidelines, not anxiety. For most small benign-appearing cysts under 2 cm, the right move is no immediate action with a guideline-directed repeat in 6 to 12 months. Cysts with concerning features get referred to the appropriate specialist for further characterization.

Why is repeat imaging often the wrong instinct?

Most "abnormal" findings are stable and benign. Repeating a scan without a new clinical question usually confirms what we already knew and adds to anxiety. We watch findings on the cadence the guidelines support rather than the cadence worry suggests.

How do you think about radiation dose across scans?

We treat radiation dose as a cost to weigh against the answer. Low-dose CT for lung cancer screening in a smoker is well worth a small dose. A PET-CT (around 25 mSv) for screening a healthy adult is not. Modern CT protocols have lowered doses significantly, and ultrasound and MRI have none. We pick the lowest-dose modality that answers the question.

How do you decide between hospital and independent imaging centers in Philadelphia?

We choose based on the complexity of the question, the radiologist subspecialty needed, and your insurance and cost preferences. Penn, Jefferson, and Temple are best for complex cases and subspecialty reads. Independent centers in Center City, the suburbs, and Northern Liberties are often faster and lower cost for routine MRI, CT, and ultrasound.

Why do you often pair imaging with advanced lipid and biomarker panels?

Imaging shows the current state, and labs show the ongoing risk drivers. Pairing them answers a different question: the scan tells you whether plaque is there, and the labs tell you whether your trajectory is still building it. An ApoB that has crept up over 5 years tells a very different story than a stable one, even when the scan looks the same.

How does your imaging philosophy change in younger patients?

In younger patients with lower baseline cardiovascular risk and more years ahead, we are more selective with radiation-using imaging and lean toward MRI, ultrasound, or careful watchful waiting on benign findings. The lifetime cost of an incidental finding workup is larger when more years are ahead of you.

What is the role of AI-assisted imaging reads?

AI adds quantitative measurement and consistency to expert radiology. Cleerly for coronary plaque, AI-assisted lung nodule tracking, and AI-flagged mammography reads are credible examples. AI does not replace the radiologist; it makes the read reproducible across time and centers.

Why is the "would this change the plan" test so central to your approach?

Because imaging is not a substitute for clinical thinking. If the plan is the same either way, we are scanning to feel better rather than to decide better. The discipline of stopping at the test protects you from both unnecessary scans and the anxiety those scans seed.

When should I get a scan?

You should get a scan when the answer would change your treatment, follow-up plan, or prevention strategy. If the next step would be the same whether the scan is positive or negative, the scan usually is not adding value.

What is the difference between a CT and an MRI?

CT uses X-ray and is fast and excellent for bone, lung, acute bleeding, and coronary arteries. MRI uses magnetic fields and is excellent for soft tissue, brain, spine, joints, and cardiac muscle. CT involves radiation; MRI does not. Speed, cost, and what you are looking for all factor in.

Should I get a full-body MRI for screening?

For most average-risk adults, no. Whole-body MRI in healthy people finds an incidental abnormality in 30 to 60 percent of cases and a true early cancer in about 1 to 2 percent. The scan is most useful for patients with specific genetic risk, a strong family history, prior cancer, or unexplained symptoms a standard workup has not solved.

Is a calcium score enough for cardiovascular risk?

A calcium score is a useful starting point, but it only sees old, hardened plaque. Most heart attacks happen in soft plaque that has not calcified yet. For higher-risk patients, coronary CT angiography (CCTA) with plaque analysis sees both calcified and soft plaque and is a more complete picture.

Why not scan everything to be safe?

Scanning everything is not safer. Incidental findings drive follow-up scans, biopsies, and anxiety, with measurable costs and no outcome benefit at the population level. Selective, question-driven imaging gives better answers with less harm.

How long does it take to get an imaging report back?

Most CT and MRI reports return within 24 to 72 hours. Echocardiogram and ultrasound reports often return the same day or next business day. Specialty scans like Cleerly plaque analysis or Galleri liquid biopsy take 1 to 4 weeks.

Will my insurance cover the scan?

Insurance usually covers imaging with a clear clinical indication, like documented symptoms or abnormal labs. Calcium scores are often self-pay (around 100 dollars). Coronary CTA and MRI usually need prior authorization, which our team handles. Boutique full-body scans like Prenuvo are usually self-pay.

How do I know if I really need a repeat scan?

You need a repeat scan when guidelines call for it or a new clinical question changes the picture. Repeat scans for the same benign finding on an anxious cadence almost never change the plan. We follow published surveillance guidelines and avoid repeat imaging that adds anxiety without information.

How does Cleerly AI change cardiovascular imaging?

Cleerly AI turns a subjective radiologist read into a quantitative, reproducible measurement of plaque burden, type, and distribution. Instead of "moderate plaque," you get an exact volume by plaque category. That precision lets us track regression on therapy and decide whether to escalate medication or lifestyle changes.

What is the incidentaloma rate and why does it matter so much?

The incidentaloma rate on whole-body MRI is 30 to 60 percent in healthy adults, and nearly all of those findings are benign. Each one still triggers follow-up imaging, biopsies, or surveillance that carries time, dollar, and psychological costs. At population scale, the cumulative harm from those workups is the strongest argument for selective imaging.

How do you sequence labs and imaging?

We sequence labs first, then imaging only when labs and clinical context warrant it. ApoB, Lp(a), fasting insulin, hsCRP, and a careful history usually tell us where to look. An elevated ApoB plus family history pushes us toward CCTA; a clear panel often makes a deep scan unnecessary.

When is liquid biopsy preferable to imaging?

Liquid biopsy (Galleri and similar) is often preferable to whole-body imaging when the question is "is there a hidden cancer signal?" without a specific organ in mind. It has a lower incidentaloma burden and can detect signals from cancers MRI struggles with (gastric, colorectal, head and neck). It is often paired with targeted imaging rather than replaced by it.

How do you handle a small finding on a scan, like a 4 mm cyst?

We handle small findings by following published surveillance guidelines, not anxiety. For most small benign-appearing cysts under 2 cm, the right move is no immediate action with a guideline-directed repeat in 6 to 12 months. Cysts with concerning features get referred to the appropriate specialist for further characterization.

Why is repeat imaging often the wrong instinct?

Most "abnormal" findings are stable and benign. Repeating a scan without a new clinical question usually confirms what we already knew and adds to anxiety. We watch findings on the cadence the guidelines support rather than the cadence worry suggests.

How do you think about radiation dose across scans?

We treat radiation dose as a cost to weigh against the answer. Low-dose CT for lung cancer screening in a smoker is well worth a small dose. A PET-CT (around 25 mSv) for screening a healthy adult is not. Modern CT protocols have lowered doses significantly, and ultrasound and MRI have none. We pick the lowest-dose modality that answers the question.

How do you decide between hospital and independent imaging centers in Philadelphia?

We choose based on the complexity of the question, the radiologist subspecialty needed, and your insurance and cost preferences. Penn, Jefferson, and Temple are best for complex cases and subspecialty reads. Independent centers in Center City, the suburbs, and Northern Liberties are often faster and lower cost for routine MRI, CT, and ultrasound.

Why do you often pair imaging with advanced lipid and biomarker panels?

Imaging shows the current state, and labs show the ongoing risk drivers. Pairing them answers a different question: the scan tells you whether plaque is there, and the labs tell you whether your trajectory is still building it. An ApoB that has crept up over 5 years tells a very different story than a stable one, even when the scan looks the same.

How does your imaging philosophy change in younger patients?

In younger patients with lower baseline cardiovascular risk and more years ahead, we are more selective with radiation-using imaging and lean toward MRI, ultrasound, or careful watchful waiting on benign findings. The lifetime cost of an incidental finding workup is larger when more years are ahead of you.

What is the role of AI-assisted imaging reads?

AI adds quantitative measurement and consistency to expert radiology. Cleerly for coronary plaque, AI-assisted lung nodule tracking, and AI-flagged mammography reads are credible examples. AI does not replace the radiologist; it makes the read reproducible across time and centers.

Why is the "would this change the plan" test so central to your approach?

Because imaging is not a substitute for clinical thinking. If the plan is the same either way, we are scanning to feel better rather than to decide better. The discipline of stopping at the test protects you from both unnecessary scans and the anxiety those scans seed.

When to Order Imaging: How We Decide What's Worth Scanning

TL;DR30-second take

Imaging is one of medicine's strongest tools and one of its biggest sources of unnecessary anxiety. The deciding question is not "what could a scan find?" but "what would I do with the answer?" If a scan would change the plan, it earns its place. If it would not, we skip it, no matter how impressive the technology. Whole-body MRI in healthy adults finds an incidental abnormality in 30 to 60 percent of cases and a true early cancer in about 1 to 2 percent, so we use it selectively. The most useful imaging is matched closely to a specific clinical question. The most harmful is the asymptomatic full-body scan that sets off a year of follow-up for findings that meant nothing.

The modern imaging world is incredible. We can see soft plaque in the coronary arteries before it ruptures, characterize tissue without touching the patient, and catch early cancers before any symptom shows up. Used well, imaging is one of the most powerful prevention tools in medicine. Used poorly, it sends people into a year of biopsies for findings that mean nothing.

The line between those outcomes is not the technology. It is the question we are trying to answer when we order the scan.

The one test I run before ordering any scan

The question I ask before every imaging order is simple: would the answer change the plan?

If a positive result would lead to a treatment change, a tighter-cadence follow-up, or a meaningful update to your prevention strategy, the scan earns its place. If the answer would lead to the same next step either way, the scan is not adding value and is probably adding cost, time, and the risk of an incidental finding.

That single question filters out most of the over-imaging I see in patient charts. People come in with 5 scans from different practices, and the plan looks the same as it did before they had them. Imaging is here to move the plan forward. A scan that only adds a line to the chart has not earned its place.

Why "more data" can hurt you

The instinct is that more information is always better. With imaging, that is sometimes the opposite of the truth.

The high sensitivity that lets a modern scanner catch a 5 mm early cancer also catches a 5 mm benign cyst, a stable nodule that has been there for 20 years, a quirk in your liver that means nothing. In whole-body MRI cohorts, 30 to 60 percent of healthy adults have at least one finding that prompts the radiologist to recommend follow-up imaging. The true cancer detection rate in screening is usually 1 to 2 percent.

The cost of that gap goes well beyond dollars. It is months of repeat scans, possible biopsies, and the steady anxiety of knowing a scan flagged "something" while you wait to find out what. For an average-risk person, that trade-off rarely pays off. This is the incidentaloma problem, and it is the single best reason to scan deliberately rather than broadly.

How I match the scan to the question

Every imaging modality is a different lens. Picking the wrong one is like using a microscope to look at the moon.

Modality	Best at	When we use it
Ultrasound	Soft tissue and motion as it happens	Echocardiogram for the pump and valves, abdominal for gallbladder or liver, vascular for carotid plaque or DVT. No radiation, low cost, often the first move.
CT	Bone, lung air, acute bleeding, coronary arteries	Coronary calcium scoring and coronary CT angiography for cardiovascular risk; low-dose CT for lung cancer in smokers; CT for acute chest, abdominal, or head pain.
MRI	Soft-tissue characterization without radiation	Brain and spine, joints, prostate, cardiac muscle. Slower and pricier, with a higher rate of incidentals if used broadly.
Nuclear / PET-CT	Functional and metabolic imaging	Staging and tracking known cancer; not for screening healthy adults (radiation dose is significant).
Liquid biopsy + genetics	A complementary first answer	Galleri and targeted genetic panels can change whether imaging is even the next move.

The sequence usually goes: clinical question first, simplest answer-getting tool next, deeper scan only if those did not settle it.

When imaging is high-leverage

A short list of the places imaging is most worth ordering in our practice:

Coronary CT angiography (CCTA) with plaque analysis in patients with elevated ApoB, Lp(a), strong family history, or atypical chest pain. Unlike a calcium score, a CCTA sees the soft plaque most likely to rupture and trigger a heart attack. Finding it in your 40s is a gift; it changes the medication and lifestyle plan immediately. The 2021 chest pain guidelines now favor CCTA over stress testing in many low-to-intermediate-risk new chest pain workups.
Coronary artery calcium (CAC) score in age 40 to 75 patients at borderline cardiovascular risk where the question is "do we start a statin?" A zero CAC can defer; a high CAC can earn one. The data here is strong.
Echocardiogram for shortness of breath, murmurs, suspected heart failure, or valve issues. Cheap, fast, no radiation.
Targeted MRI for a specific neurological sign, a confirmed disc herniation deciding surgery, or a cardiac question after an abnormal echo.
Standard cancer screenings with decades of outcomes data: colonoscopy, mammography, low-dose CT for lung cancer in smokers, Pap. Boring, well-validated, and the highest-yield imaging most people will ever do.
Whole-body MRI or boutique scans for patients with a Li-Fraumeni or other strong cancer-predisposition syndrome, BRCA, prior cancer history, or persistent unexplained symptoms a standard workup has missed.

When imaging is low-leverage (or harmful)

The places imaging often does more harm than good:

Asymptomatic full-body MRI in an average-risk person. High incidental finding rate, long follow-up tail, modest evidence for outcome benefit at average risk. For the average 40-year-old without specific genetic risk, this scan is mostly bought for peace of mind and often delivers the opposite.
Routine thyroid ultrasound without a palpable nodule, family history of thyroid cancer, or specific clinical indication. Finds many small benign nodules that drive years of surveillance.
PET-CT for screening healthy adults. High radiation dose (around 25 mSv), high false-positive rate. PET-CT is the right tool for staging known cancer and tracking treatment, and the wrong tool for screening someone without symptoms.
MRI for non-specific chronic back pain in the first month without red-flag signs. Most degenerative findings on lumbar MRI show up in asymptomatic adults too, and the scan rarely changes the conservative-care plan.
Repeat imaging on an existing benign finding without a new clinical question. Once a stable nodule or cyst has been characterized, repeat scans should follow guideline cadence rather than anxiety.

Fishtown Medicine

A 90-minute conversation with Dr. Ash. A written plan you can actually follow.

Start your intake

How we make the order happen

Once we have decided a scan is worth ordering, the goal is to make the rest feel like one smooth step instead of a string of separate errands.

The order goes from your chart directly to a facility that fits your insurance, location, or cash-pay preference. We coordinate with Medmo for many imaging orders, particularly MRI, CT, and ultrasound; Medmo helps you schedule at a nearby facility and shows you cash-pay pricing where it fits.
For complex cases, we work with Penn, Jefferson, Temple, and select Mainline facilities so the radiology subspecialty matches your question. For routine MRI and CT, independent imaging centers in Center City, Northern Liberties, and the suburbs are often faster and cheaper.
Prior authorizations for MRI, CCTA, and similar are handled by our team. You should not have to chase your own insurer.
When the report comes back, you get a summary written for you rather than a copy-pasted radiology read. Incidental findings get sorted into three groups: the ones that matter, the ones to watch on guideline cadence, and the ones to set aside.

See Managing Labs and Imaging with Ease for the full logistics view.

Guidance from the clinic

"More data is not always better data. The most useful imaging is the imaging that changes the plan. The most harmful is the asymptomatic full-body scan that finds a thing, sets off a year of follow-up, and ends right where you started, except more anxious. Before we scan, we agree on the question. After we scan, we agree on what the answer means. Without those two conversations, even great imaging is just a story without a point."

Actionable Steps

Before you ask for a scan.

Name the question. What specifically do you want to know? "Is there plaque in my coronary arteries?" is a question a scan can answer. "I want to make sure nothing is wrong" is a hope, and no scan can settle it.
Ask what changes. If the result comes back positive, what is the plan? If negative, what is the plan? If those answers are the same, the scan is probably not the move.
Match the modality. Soft-tissue questions usually want MRI or ultrasound. Bone, lung, and acute questions usually want CT. Cardiovascular risk wants CCTA or CAC.
Start simple if you can. ApoB, Lp(a), and a thorough family history often tell us where to scan and where not to.
Plan the result conversation in advance. Decide who will read the report, who will translate it, and what follow-up cadence you are committing to before the scan.

Key Takeaways

The deciding question for any scan is whether the answer would change the plan. If not, do not order it.
Modern imaging is sensitive enough to find incidental things in 30 to 60 percent of healthy adults; selective imaging beats broad imaging at every scale.
Pick the modality to match the question: ultrasound and echo for soft tissue and motion, CT for bone and acute findings, MRI for soft-tissue characterization, CCTA with plaque analysis for cardiovascular risk.
Standard cancer screenings (colonoscopy, mammography, low-dose CT in smokers, Pap) are still the highest-yield imaging most people will ever do.
Logistics matter as much as the order. Coordination, prior authorizations, and result translation are what make imaging useful.

A note on cost: any discount we negotiate on labs and imaging passes straight through to you, with no markup. Our affordable labs and imaging guide covers how the billing works.

Scientific References

Gulati, M., et al. (2021). 2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR Guideline for the Evaluation and Diagnosis of Chest Pain. Journal of the American College of Cardiology, 78(22), e187-e285.
Greenland, P., et al. (2018). Coronary Calcium Score and Cardiovascular Risk. Journal of the American College of Cardiology, 72(4), 434-447.
Williams, M. C., et al. (2020). Coronary Atherosclerosis Imaging by Coronary CT Angiography for the Prevention of Cardiovascular Events. Circulation: Cardiovascular Imaging, 13(8), e009829.
Berland, L. L., et al. (2010). Managing Incidental Findings on Abdominal CT: White Paper of the ACR Incidental Findings Committee. Journal of the American College of Radiology, 7(10), 754-773.
Hricak, H., et al. (2021). Medical imaging and nuclear medicine: a Lancet Oncology Commission. The Lancet Oncology, 22(4), e136-e172.
Schrag, D., et al. (2023). Blood-based tests for multicancer early detection (PATHFINDER): a prospective cohort study. The Lancet, 402(10409), 1251-1260.

Fishtown Medicine | Diagnostics

2418 E York St, Philadelphia, PA 19125(267) 360-7927 hello@fishtownmedicine.comHSA/FSA Eligible

Start Your Intake

Frequently Asked Questions

Common Questions

Deep-Dive Questions

Ready when you are

Start your intake

Dr. Ash reads every intake himself, and answers questions personally - usually within a few hours.

TL;DR30-second take

The line between those outcomes is not the technology. It is the question we are trying to answer when we order the scan.

The one test I run before ordering any scan

The question I ask before every imaging order is simple: would the answer change the plan?

Why "more data" can hurt you

The instinct is that more information is always better. With imaging, that is sometimes the opposite of the truth.

How I match the scan to the question

Every imaging modality is a different lens. Picking the wrong one is like using a microscope to look at the moon.

Modality	Best at	When we use it
Ultrasound	Soft tissue and motion as it happens	Echocardiogram for the pump and valves, abdominal for gallbladder or liver, vascular for carotid plaque or DVT. No radiation, low cost, often the first move.
CT	Bone, lung air, acute bleeding, coronary arteries	Coronary calcium scoring and coronary CT angiography for cardiovascular risk; low-dose CT for lung cancer in smokers; CT for acute chest, abdominal, or head pain.
MRI	Soft-tissue characterization without radiation	Brain and spine, joints, prostate, cardiac muscle. Slower and pricier, with a higher rate of incidentals if used broadly.
Nuclear / PET-CT	Functional and metabolic imaging	Staging and tracking known cancer; not for screening healthy adults (radiation dose is significant).
Liquid biopsy + genetics	A complementary first answer	Galleri and targeted genetic panels can change whether imaging is even the next move.

The sequence usually goes: clinical question first, simplest answer-getting tool next, deeper scan only if those did not settle it.

When imaging is high-leverage

A short list of the places imaging is most worth ordering in our practice:

Coronary CT angiography (CCTA) with plaque analysis in patients with elevated ApoB, Lp(a), strong family history, or atypical chest pain. Unlike a calcium score, a CCTA sees the soft plaque most likely to rupture and trigger a heart attack. Finding it in your 40s is a gift; it changes the medication and lifestyle plan immediately. The 2021 chest pain guidelines now favor CCTA over stress testing in many low-to-intermediate-risk new chest pain workups.
Coronary artery calcium (CAC) score in age 40 to 75 patients at borderline cardiovascular risk where the question is "do we start a statin?" A zero CAC can defer; a high CAC can earn one. The data here is strong.
Echocardiogram for shortness of breath, murmurs, suspected heart failure, or valve issues. Cheap, fast, no radiation.
Targeted MRI for a specific neurological sign, a confirmed disc herniation deciding surgery, or a cardiac question after an abnormal echo.
Standard cancer screenings with decades of outcomes data: colonoscopy, mammography, low-dose CT for lung cancer in smokers, Pap. Boring, well-validated, and the highest-yield imaging most people will ever do.
Whole-body MRI or boutique scans for patients with a Li-Fraumeni or other strong cancer-predisposition syndrome, BRCA, prior cancer history, or persistent unexplained symptoms a standard workup has missed.

When imaging is low-leverage (or harmful)

The places imaging often does more harm than good:

Asymptomatic full-body MRI in an average-risk person. High incidental finding rate, long follow-up tail, modest evidence for outcome benefit at average risk. For the average 40-year-old without specific genetic risk, this scan is mostly bought for peace of mind and often delivers the opposite.
Routine thyroid ultrasound without a palpable nodule, family history of thyroid cancer, or specific clinical indication. Finds many small benign nodules that drive years of surveillance.
PET-CT for screening healthy adults. High radiation dose (around 25 mSv), high false-positive rate. PET-CT is the right tool for staging known cancer and tracking treatment, and the wrong tool for screening someone without symptoms.
MRI for non-specific chronic back pain in the first month without red-flag signs. Most degenerative findings on lumbar MRI show up in asymptomatic adults too, and the scan rarely changes the conservative-care plan.
Repeat imaging on an existing benign finding without a new clinical question. Once a stable nodule or cyst has been characterized, repeat scans should follow guideline cadence rather than anxiety.

Fishtown Medicine

A 90-minute conversation with Dr. Ash. A written plan you can actually follow.

Start your intake

How we make the order happen

Once we have decided a scan is worth ordering, the goal is to make the rest feel like one smooth step instead of a string of separate errands.

The order goes from your chart directly to a facility that fits your insurance, location, or cash-pay preference. We coordinate with Medmo for many imaging orders, particularly MRI, CT, and ultrasound; Medmo helps you schedule at a nearby facility and shows you cash-pay pricing where it fits.
For complex cases, we work with Penn, Jefferson, Temple, and select Mainline facilities so the radiology subspecialty matches your question. For routine MRI and CT, independent imaging centers in Center City, Northern Liberties, and the suburbs are often faster and cheaper.
Prior authorizations for MRI, CCTA, and similar are handled by our team. You should not have to chase your own insurer.
When the report comes back, you get a summary written for you rather than a copy-pasted radiology read. Incidental findings get sorted into three groups: the ones that matter, the ones to watch on guideline cadence, and the ones to set aside.

See Managing Labs and Imaging with Ease for the full logistics view.

Guidance from the clinic

Actionable Steps

Before you ask for a scan.

Name the question. What specifically do you want to know? "Is there plaque in my coronary arteries?" is a question a scan can answer. "I want to make sure nothing is wrong" is a hope, and no scan can settle it.
Ask what changes. If the result comes back positive, what is the plan? If negative, what is the plan? If those answers are the same, the scan is probably not the move.
Match the modality. Soft-tissue questions usually want MRI or ultrasound. Bone, lung, and acute questions usually want CT. Cardiovascular risk wants CCTA or CAC.
Start simple if you can. ApoB, Lp(a), and a thorough family history often tell us where to scan and where not to.
Plan the result conversation in advance. Decide who will read the report, who will translate it, and what follow-up cadence you are committing to before the scan.

Key Takeaways

The deciding question for any scan is whether the answer would change the plan. If not, do not order it.
Modern imaging is sensitive enough to find incidental things in 30 to 60 percent of healthy adults; selective imaging beats broad imaging at every scale.
Pick the modality to match the question: ultrasound and echo for soft tissue and motion, CT for bone and acute findings, MRI for soft-tissue characterization, CCTA with plaque analysis for cardiovascular risk.
Standard cancer screenings (colonoscopy, mammography, low-dose CT in smokers, Pap) are still the highest-yield imaging most people will ever do.
Logistics matter as much as the order. Coordination, prior authorizations, and result translation are what make imaging useful.

A note on cost: any discount we negotiate on labs and imaging passes straight through to you, with no markup. Our affordable labs and imaging guide covers how the billing works.