Gastric Emptying Study — Dictation, Appropriateness, and Dose for Residents

1. The Attending-Ready Gastric Emptying Report

You’re on the nucs rotation. The list has an outpatient Gastric Emptying Study for a patient with long-standing diabetes and chronic nausea. The referring gastroenterologist wants a definitive answer on gastroparesis, and your attending expects a report with the exact retention percentages at every timepoint, correctly calculated using the geometric mean, and a conclusion that cites the current consensus criteria. It’s not a complex read, but it’s all about the numbers — get one wrong, and the whole study is misinterpreted.

When I was a resident, I’d double-check my math on these, because a simple transposition error could turn a normal study into a diagnosis of severe gastroparesis. The key is a systematic approach to both the analysis and the dictation. We’ll walk through a template that ensures you hit every key point, every time. For more guides like this, check out our free trainee calculators and references.

2. What a Nuclear Medicine Gastric Emptying Study Covers and What Attendings Look For

A solid-phase gastric emptying study is the gold standard for quantitatively evaluating the rate at which food leaves the stomach. It’s a functional study, not an anatomic one. The primary clinical questions it answers are whether the patient has delayed gastric emptying (gastroparesis) or abnormally rapid emptying (dumping syndrome).

This study is commonly ordered for patients with symptoms like chronic nausea, vomiting, early satiety, or postprandial fullness, especially in the context of diabetes, previous gastric surgery (like vagotomy), or idiopathic dyspepsia. Your attending is looking for a report that clearly states:

• The exact meal and radiotracer used (confirming a standardized protocol).
• The calculated percentage of radiotracer retained in the stomach at 1, 2, 3, and 4 hours.
• A clear, evidence-based conclusion diagnosing gastroparesis (and its severity) or rapid emptying, based on established criteria.
• Mention of any factors that could affect the study’s validity, like patient non-compliance with the meal or elevated blood glucose.

3. Radiology Report Template for a Nuclear Medicine Gastric Emptying Study (Solid)

This template is designed for the standard 4-hour solid-phase study. You can adapt it for liquid-phase studies or combined studies as needed. Use this as a starting point for your macros.

Technique

A solid-phase gastric emptying study was performed following oral administration of approximately [0.5-1.0] mCi of Technetium-99m sulfur colloid mixed with scrambled eggs (standardized meal including 2 slices of toast, jelly, and 4 ounces of water). The patient consumed the meal within 10 minutes.

Anterior and posterior static images of the stomach were obtained immediately after meal completion and at 1, 2, 3, and 4 hours post-ingestion. Gastric retention was calculated at each timepoint using the geometric mean of anterior and posterior counts, corrected for radioactive decay.

The patient’s blood glucose level prior to the study was [###] mg/dL.

Findings

The percentage of gastric retention of the radiolabeled solid meal is as follows:

• At 1 hour: [##]% (Normal: >30% and <90%)
• At 2 hours: [##]% (Normal: <60%)
• At 3 hours: [##]%
• At 4 hours: [##]% (Normal: <10%)

No abnormal extragastric radiotracer activity is identified to suggest significant gastroesophageal reflux or pulmonary aspiration during the study.

Impression

[Option 1: Normal]
Normal solid-phase gastric emptying. No evidence of gastroparesis or rapid gastric emptying.

[Option 2: Delayed / Gastroparesis]
Delayed solid-phase gastric emptying, consistent with gastroparesis. Retention at 4 hours is [##]%, which corresponds to [mild/moderate/severe/very severe] gastroparesis.
(Severity at 4 hours: Mild 11-20%; Moderate 21-35%; Severe 36-50%; Very Severe >50%)

[Option 3: Rapid Emptying]
Rapid solid-phase gastric emptying, with [##]% retention at 1 hour (normal >30%). Findings may be seen in dumping syndrome.

4. Free Radiology Report Template Sources

Building a personal library of high-quality templates is a rite of passage in residency. If you’re looking for broader collections beyond what we cover here, two great free repositories exist. The RSNA maintains RadReport.org, which is a comprehensive, peer-reviewed library. Another excellent resource is Radiology Templates (AU), an Australian-maintained site with a clean interface and practical templates.

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

The template above is solid, but manually plugging in numbers and choosing the right impression line by line can be tedious, especially on a busy service. This is where AI-assisted reporting tools can streamline your workflow. Instead of clicking through a macro, you can dictate the positive findings in free form—”retention at four hours was 25 percent”—and the AI structures it for you.

GigHz Precision AI is designed for this. It takes your free-form dictation of the key findings and generates a clean, structured report based on pre-loaded ACR and society-backed templates. It helps ensure your quantitative results are placed correctly and the impression accurately reflects the data based on consensus guidelines. This approach lets you focus on the image analysis, not on navigating dictation software templates. You can learn more about the radiology report assistant on the main product page.

6. Clinical Decision Support (CDS) Popups

For many complex studies like liver MRI or renal mass CT, our platform incorporates specific Clinical Decision Support (CDS) popups that guide you through frameworks like LI-RADS or Bosniak classification. These tools fire automatically based on your findings to ensure you don’t miss a required data point.

The Gastric Emptying Study is more straightforward and quantitative. As such, **no specific CDS popup fires for this template**. Instead, the AI’s primary role here is in “AI Refine”—translating your dictated percentages directly into the structured findings and selecting the correct impression based on the established diagnostic thresholds for gastroparesis or rapid emptying.

7. When Should You Order a Gastric Emptying Study? ACR Appropriateness Criteria

Deciding on the right imaging is as important as reading it correctly. The American College of Radiology (ACR) provides evidence-based guidelines for common clinical scenarios. For a patient presenting with chronic vomiting where a mechanical obstruction has been ruled out, the key question is whether a motility disorder like gastroparesis is the cause.

According to the ACR Appropriateness Criteria for Vomiting in Adults, a gastric emptying scan is Usually Appropriate for the initial evaluation of suspected gastroparesis. It directly answers the clinical question by quantifying motility. While it’s the standard, a few alternatives exist. The wireless motility capsule (SmartPill) is also considered Usually Appropriate and avoids radiation. Breath testing is another non-invasive option that May Be Appropriate. For acute symptoms or suspected obstruction, however, endoscopy or cross-sectional imaging like CT would be the first-line choice.

8. How Much Radiation Does a Gastric Emptying Study Deliver?

Patients often ask about radiation, and it’s our job to provide clear answers. A solid-phase gastric emptying study delivers a very low effective radiation dose, typically in the range of 0.4 to 0.5 mSv. This is less than the average annual background radiation a person receives just from living in the United States (about 3 mSv per year).

To put it in context, the ACR has a relative radiation level (RRL) scale to help compare studies. This exam falls into the lowest category.

The dose is minimal because the amount of radiotracer (Tc-99m sulfur colloid) is small and has a short half-life. No specific dose-reduction techniques are needed given the inherently low exposure.

9. Nuclear Medicine Gastric Emptying Study Protocol — Meal, Timing, and Analysis

The validity of a gastric emptying study hinges on strict adherence to a standardized protocol. Deviations, especially in the meal composition, can invalidate the results because normal emptying times are meal-dependent. The consensus protocol is the 4-hour low-fat, egg-white meal.

Below is a summary of the key parameters. Getting these right is the tech’s job, but understanding them is yours—it helps you spot a potentially flawed study.

A common protocol pitfall is using a non-standard meal. In the past, oatmeal or other foods were used, but their normal emptying ranges differ. If you see a study performed with a different meal, the standard diagnostic criteria may not apply, a critical point to mention in your report.

10. The 3-Months-Free Offer for Residents and Fellows

3+ months free for radiology residents and fellows.

If you want to look like a rockstar on your reports, this is for you. The GigHz platform lets you dictate your positive findings in free form, and our AI generates a perfectly structured report using ACR and SIR templates. The appropriate Clinical Decision Support fires automatically, ensuring your reports are complete and compliant with the latest guidelines. It helps you move faster without sacrificing quality.

All we ask in return is your feedback so we can keep improving the product for trainees. To get set up, just provide three items:

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

There’s no credit card required and no long forms. Simply apply for the residents free-access program by replying with those three details, and we’ll get your account configured.

11. Frequently Asked Questions (FAQ)

Is GigHz Precision AI HIPAA-compliant?

Yes. The platform is designed for de-identified workflows by default. You dictate findings, not raw PHI. All data is handled within a secure, HIPAA-compliant environment.

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

No. GigHz Precision AI is a secure, browser-based tool. There’s no software to install on hospital machines. It works on the computer in the reading room, your personal laptop, or even an iPad on call.

Does this replace PowerScribe or other dictation systems?

No, it works alongside them. Most residents dictate their findings into the GigHz web app, let the AI generate the structured report, and then copy-paste the final, clean text into their PACS/RIS dictation system. It complements your existing workflow, it doesn’t replace it.

Can I customize the templates?

Yes. While the platform comes pre-loaded with ACR, SIR, and other society-standard templates, you can create and save your own variations to match your personal style or your institution’s specific requirements.

What happens after I finish residency or fellowship?

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