MRI Brain With and Without Contrast — Dictation, Appropriateness, and Dose for Residents

1. The Attending-Ready Brain MRI Read

Stat from the ED. New-onset seizure in a 50-year-old with a known history of lung cancer. The ER doc is on the phone asking about mets. You see a ring-enhancing lesion in the left frontal lobe with surrounding vasogenic edema. Then you see another one. And a third. Your attending is going to want a clear, structured report with a tight differential for every finding, and they want it now.

When I was a resident, the differential for a ring-enhancing lesion was one of those things you just had to have memorized cold: metastasis, abscess, glioblastoma, demyelination… the list goes on. Forgetting one under pressure is easy to do. This guide breaks down the MRI Brain With and Without Contrast—from protocol to a dictation template—to help you nail these reads every time. For more guides like this, check out the residents and fellows resource hub, which has free calculators, references, and templates for trainees.

2. What an MRI Brain With and Without Contrast Covers and What Attendings Look For

The MRI Brain With and Without Contrast is the gold standard for evaluating suspected brain tumors, infections, active demyelinating disease, and post-operative changes. The “without contrast” sequences give us the baseline anatomy and signal characteristics, while the “with contrast” (post-gadolinium) sequences highlight areas where the blood-brain barrier has broken down. This enhancement is the key to the study.

Attendings expect a systematic report that directly answers the clinical question. This isn’t just about finding the lesion; it’s about characterizing it completely.

Your report should confidently address:

• Enhancing masses or tumors: Describe the location, size, multiplicity, and pattern of enhancement. Is it solid, ring-enhancing, or patchy?
• Blood-brain barrier breakdown: This is what enhancement signifies. Note its extent and pattern.
• Active demyelinating plaques: In a patient with multiple sclerosis, gadolinium enhancement indicates active inflammation, distinguishing a new lesion from an old, chronic one.
• Brain abscess: Look for the classic combination of a smooth, thin-walled ring of enhancement with central restricted diffusion on DWI.
• Meningeal enhancement: Differentiate between leptomeningeal (pia and arachnoid) and pachymeningeal (dura) enhancement to narrow the differential between meningitis/carcinomatosis and intracranial hypotension.
• Post-treatment changes: Compare with prior studies to distinguish tumor recurrence from radiation necrosis or other treatment effects.

3. Radiology Report Template for MRI Brain With and Without Contrast

Here is a solid, structured template you can adapt for your macros. It covers the key elements your attendings will be looking for.

Technique

Multiplanar, multisequence magnetic resonance imaging of the brain was performed without and with intravenous contrast. A total of [X] mL of [Gadavist/ProHance/Dotarem] was administered. Pre-contrast sequences include sagittal T1, axial T2, axial FLAIR, axial diffusion-weighted imaging (DWI), and axial susceptibility-weighted imaging (SWI). Post-contrast sequences include axial, coronal, and sagittal T1-weighted imaging.

Findings

Ventricles and Extra-Axial Spaces: The ventricles, sulci, and cisterns are normal in size and configuration. No extra-axial fluid collections.

Brain Parenchyma:
Gray-white matter differentiation is preserved.
No evidence of acute territorial infarct or intracranial hemorrhage.
Diffusion-weighted images demonstrate no areas of restricted diffusion.
Susceptibility-weighted images demonstrate no abnormal areas of susceptibility artifact to suggest hemorrhage or calcification.

[If findings are present, describe them here. Example:]
There is a [size] cm ring-enhancing lesion in the [location, e.g., left frontal subcortical white matter]. It demonstrates significant surrounding T2/FLAIR hyperintense signal consistent with vasogenic edema and associated mass effect on [adjacent structures]. Centrally, the lesion demonstrates [restricted/facilitated] diffusion. After administration of contrast, there is [avid ring/nodular/irregular] enhancement.

Post-Contrast Evaluation: No abnormal parenchymal, leptomeningeal, or pachymeningeal enhancement is identified, other than as described above. The major dural venous sinuses are patent. The visualized portions of the orbits and paranasal sinuses are unremarkable.

Impression

1. [Size] cm ring-enhancing lesion in the [location] with surrounding vasogenic edema, as described above. The differential diagnosis for a ring-enhancing lesion includes metastatic disease, primary glial neoplasm, abscess, and less likely, a demyelinating lesion or subacute infarct.

2. No evidence of acute infarct or intracranial hemorrhage.

4. Looking for More? Free Radiology Template Repositories

Building your own template library is a rite of passage. But you don’t have to start from scratch. Beyond the templates we share here, two great free repositories exist that are worth bookmarking. These are honest-to-goodness free resources maintained by major radiology organizations.

• RadReport.org: This is the RSNA-curated library. It’s comprehensive, peer-reviewed, and has templates for nearly every study you can think of.
• Radiology Templates (AU): Maintained by Australian radiologists, this site offers a clean interface and a great collection of templates, often with helpful diagrams and clinical notes.

5. The Next-Level Move: From Free-Form Dictation to a Structured Report

A good template is your starting point, but the real magic is turning your free-form observations into a perfectly structured report without breaking your flow. This is where AI-powered tools can make a huge difference. Instead of clicking through a macro, you can simply dictate your positive findings—”left frontal ring-enhancing lesion with edema and central restriction”—and let the software handle the rest.

Tools like GigHz Precision AI are designed for this exact workflow. It takes your natural language dictation and organizes it into a clean, structured report based on pre-loaded ACR and SIR templates. For studies that require specific classification systems, it can surface the appropriate Clinical Decision Support (CDS) to guide you through the criteria, ensuring your impression is complete and accurate. It’s about streamlining the repetitive parts of reporting so you can focus on the diagnostic puzzle.

6. When Should You Order an MRI Brain With and Without Contrast? ACR Appropriateness Criteria

Knowing when this study is the right first choice is key. The American College of Radiology (ACR) provides evidence-based guidelines. For a brain MRI with and without contrast, it is the first-line, “Usually Appropriate” study for a wide range of serious neurologic conditions.

According to the ACR Appropriateness Criteria for Brain Tumors, this study is rated “Usually Appropriate” for nearly all scenarios involving suspected tumors in adults. This includes initial screening in patients with genetic risk factors, evaluation of suspected primary or metastatic tumors, pretreatment surgical planning, and post-treatment surveillance.

For Cranial Neuropathy, the rating is also “Usually Appropriate” for evaluating a huge variety of nerve-specific symptoms. This applies to initial imaging for abnormalities of the olfactory (CN I), trigeminal (CN V), facial (CN VII), glossopharyngeal (CN IX), and vagus (CN X) nerves, as well as for multiple cranial nerve palsies.

The study is also “Usually Appropriate” for evaluating active Demyelinating Diseases like multiple sclerosis, for headaches with red-flag symptoms (per the Headache criteria), and for suspected Intracranial Hypotension, where it can detect the characteristic pachymeningeal enhancement.

When MRI is not feasible or contrast is contraindicated, alternatives include an MRI of the brain without contrast or a CT of the brain with and without contrast, though these are often less sensitive for the primary indications.

7. MRI Brain With and Without Contrast Imaging Protocol — Sequences, Contrast, and Key Parameters

A standardized protocol is crucial for diagnostic quality and comparability across studies. While minor variations exist between institutions, the core sequences for a brain MRI with and without contrast are highly conserved. The protocol is designed to provide anatomical detail (T1), evaluate for edema and non-enhancing lesions (T2/FLAIR), screen for hemorrhage (SWI) and ischemia (DWI), and finally, assess for blood-brain barrier disruption (post-contrast T1).

Here is a typical protocol:

Common protocol pitfalls:

• Contrast Timing: Imaging should begin approximately 5 minutes after injection to capture peak enhancement of most lesions. Imaging too early can miss or underestimate enhancement.
• Fat Saturation: For evaluating the skull base, orbits, or post-treatment changes near bone, adding fat-saturated post-contrast sequences is critical to distinguish enhancement from fatty marrow.
• Volumetric Imaging: Including a 3D T1 sequence (like MPRAGE) both pre- and post-contrast is becoming standard for volumetric analysis and precise surgical planning.

8. Look Like a Rockstar on Your Reports: A 3-Month Free Offer for Residents & Fellows

3+ months free for radiology residents and fellows

Dictate your positive findings in free form, and let our AI generate a perfectly structured report using the latest ACR and SIR templates. The appropriate clinical decision support fires automatically, helping you get to the right classification every time. It’s designed to help you look like a rockstar on your reports, especially on busy calls.

All we ask in return is your feedback so we can keep improving the product for trainees. The signup is simple—no credit card, no long forms. Just provide the following:

1. Your PGY year (e.g., PGY-2, PGY-4)
2. Your training type (radiology residency or fellowship specialty)
3. Your training program / hospital name

To get started, apply for the residents free-access program and reply to the application email with those three items. We’ll get you set up.

9. Frequently Asked Questions

Is GigHz Precision AI HIPAA-compliant?

Yes. The platform is designed for de-identified workflows by default. It does not require or store Protected Health Information (PHI) to function. All processing is done on secure, HIPAA-compliant cloud infrastructure.

Do I need my hospital’s IT department to set this up?

No. GigHz Precision AI is a browser-based tool. There’s no software to install on hospital machines. It works on any modern web browser, including the one on the call-room computer or your personal iPad.

Does it work with PowerScribe or other dictation systems?

Yes. It works alongside your existing dictation system. You can dictate into your microphone as you normally would, and the AI assistant works in a separate browser window to help you structure the report text, which you can then copy and paste into your PACS/RIS.

Can I customize the templates?

Yes. While the system comes pre-loaded with standard templates from organizations like the ACR and SIR, you can create, modify, and save your own templates and macros for personal use or to share with your program.

What happens after my residency or fellowship ends?

The free access program is specifically for trainees. After you graduate, you can transition to a standard attending plan. We offer discounts for recent graduates to help you get started in your new role.