CT Abdomen/Pelvis with IV Contrast — Dictation, Appropriateness, and Dose for Residents
1. The Workhorse Scan: Portal Venous CT Abdomen and Pelvis
The pager goes off. Stat from the ED: “45M with post-op day 5 fever and diffuse abdominal pain.” The list is already ten studies deep, and your attending wants to know if there’s a collection, an abscess, or an anastomotic leak—and they expect a clean, structured report that covers all the bases. The single-phase portal venous CT of the abdomen and pelvis is the undisputed workhorse for just about every non-traumatic abdominal complaint that walks through the door. Getting this read right—and doing it efficiently—is a core skill. When I was a resident, I’d have a macro for this study that I was constantly tweaking. The goal is to be thorough without being slow, hitting all the key findings your attending is looking for before they even have to ask. For more tips and tools, check out our free residents and fellows resource hub.
2. What a CT Abdomen and Pelvis With IV Contrast Covers and What Attendings Look For
This study is the go-to for a huge range of clinical questions, from acute pain and infection to oncologic surveillance and post-operative evaluation. The portal venous phase, timed at 60-70 seconds after IV contrast injection, provides optimal enhancement of the solid abdominal organs (especially the liver), the bowel wall, and the kidneys (in the nephrographic phase). This makes it ideal for identifying inflammation, infection, and most tumors.
Your attending expects a systematic review. Don’t just hunt for the primary finding; run through a comprehensive checklist. A solid report on a portal venous CTAP will systematically address:
- Solid Organs: Liver, gallbladder, spleen, pancreas, adrenal glands, and kidneys. Look for masses, inflammation, and signs of injury.
- Bowel and Mesentery: Evaluate for bowel wall thickening, obstruction with a transition point, mesenteric stranding, and signs of ischemia.
- Peritoneum: Check for free fluid (ascites, blood) and free air (pneumoperitoneum).
- Vasculature: Assess the aorta, IVC, and major mesenteric vessels for thrombus or aneurysm.
- Lymph Nodes: Note any enlarged or suspicious lymphadenopathy.
- Bones and Soft Tissues: Scan for fractures, lytic/blastic lesions, and abdominal wall hernias or collections.
- Lungs: Always check the lung bases for consolidation, effusion, or pulmonary embolism.
3. Radiology Report Template for CT Abdomen and Pelvis With IV Contrast (Portal Venous Phase)
This is a solid starting point for your personal macro. Modify it to fit your style, but make sure it includes these core sections. The key is to be systematic so you don’t miss an incidental finding while chasing the primary question.
Technique
Axial images of the abdomen and pelvis were obtained with a 5 mm slice thickness following the administration of [volume] mL of [contrast agent] intravenous contrast. Coronal and sagittal reformatted images with 3 mm slice thickness were also reviewed. Oral contrast was [administered/not administered].
Findings
Lungs: The visualized lung bases are clear. No pleural effusion.
Liver: Normal size and contour. No focal hepatic lesion. No intra- or extrahepatic biliary ductal dilatation. Gallbladder is unremarkable.
Spleen: Normal in size. No focal splenic lesion.
Pancreas: Unremarkable appearance. No peripancreatic fluid or inflammation.
Adrenal Glands: Unremarkable.
Kidneys and Ureters: Normal in size and position. Symmetric nephrograms. No hydronephrosis or renal calculi. Ureters are normal in caliber.
Bowel and Mesentery: The stomach, small bowel, and colon are of normal caliber. No bowel wall thickening or obstruction. The appendix is visualized and normal. No mesenteric stranding or lymphadenopathy.
Peritoneum and Retroperitoneum: No free fluid or free air. No retroperitoneal fluid collection or lymphadenopathy.
Vasculature: The visualized aorta and inferior vena cava are of normal caliber without evidence of aneurysm or thrombus.
Pelvic Organs: The urinary bladder is unremarkable. [Uterus and ovaries are unremarkable in the female patient. Prostate and seminal vesicles are unremarkable in the male patient.]
Bones and Soft Tissues: No acute osseous abnormality. The abdominal wall soft tissues are unremarkable.
Impression
1. No acute intra-abdominal or pelvic process identified.
(Or, if positive:)
1. Findings consistent with acute [appendicitis/diverticulitis/cholecystitis], as described above.
2. [Secondary or incidental finding, e.g., Small left renal cyst.]
4. Free Template Sources for Your Collection
Building your own template library is a rite of passage. But you don’t have to start from scratch. Two great free repositories exist that can give you a solid foundation for dozens of common studies. They are excellent resources for seeing how different institutions structure their reports.
- RadReport.org: Curated by the RSNA, this is a massive library of peer-reviewed templates covering nearly every modality and subspecialty. It’s a go-to for standardized, best-practice language.
- Radiology Templates (AU): This is a well-maintained, practical template library from our colleagues in Australia. It often has very user-friendly, clean templates that are easy to adapt.
5. The Next-Level Move: Free-Form Dictation to Structured Report
The biggest time sink during a busy call shift isn’t reading the scan; it’s formatting the report. You see the findings, you know what they mean, but getting it all into a clean, structured format that your attending will approve without edits takes time. This is where AI-assisted reporting can be a game-changer.
Instead of clicking through a structured template or meticulously editing a macro, you can dictate your positive findings in free form—”acute appendicitis with a 1.2 cm appendicolith and surrounding fat stranding”—and let the software handle the rest. Tools like GigHz Precision AI are designed to take that free-form dictation and generate a complete, structured report using pre-loaded ACR and SIR templates. It helps ensure all the required elements are present, from technique to a well-organized impression, which can help you create high-quality reports faster and more consistently.
6. When Should You Order a CT Abdomen and Pelvis With IV Contrast? ACR Appropriateness Criteria
The portal venous phase CTAP is the first-line study for a wide range of acute abdominal symptoms in adults. According to the American College of Radiology (ACR), it is Usually Appropriate for initial imaging in cases of suspected appendicitis in the right lower quadrant, suspected diverticulitis in the left lower quadrant, and suspected small-bowel obstruction.
The ACR also provides guidance on more specific scenarios. For instance, in a patient with new moderate bilateral hydronephrosis after a cystectomy, or a septic patient with flank pain and a dilated renal pelvis, this study is considered Usually Appropriate to evaluate for urinary tract obstruction and its cause. It’s also a key tool in post-treatment follow-up for renal cell carcinoma after surgery or ablation.
However, it’s not the best choice for everything. Key alternatives include:
- MRI Abdomen: Often preferred for characterizing liver lesions, for problem-solving in the pelvis, and in pregnant or young patients to avoid radiation.
- Ultrasound: The first-line modality for right upper quadrant pain (suspected cholecystitis), in pediatric patients with appendicitis suspicion, and in pregnant patients.
- CT Enterography: Uses neutral oral contrast to better visualize the small bowel mucosa, making it the study of choice for suspected Crohn’s disease.
- Non-Contrast CT: The standard for suspected kidney stones (CT renal stone protocol).
- Multiphase CT Protocols: Required for specific indications like characterizing liver or renal masses, evaluating for active GI bleeding, or assessing for aortic dissection.
Choosing the right initial study is key, and familiarity with the ACR Appropriateness Criteria helps guide these decisions, especially when you’re the one getting the call from the ED provider.
7. How Much Radiation Does a CT Abdomen and Pelvis With IV Contrast Deliver?
Patients and referring providers often ask about radiation dose. It’s important to have a clear, concise answer. A standard portal venous phase CT of the abdomen and pelvis delivers an estimated effective dose of 7-12 mSv. This is a moderate dose, but it’s crucial to put it in context.
The best way to frame this is by comparing it to natural background radiation, which we are all exposed to every day. The 7-12 mSv dose is comparable to several months to a few years of average natural background radiation in the United States. While we always adhere to the ALARA (As Low As Reasonably Achievable) principle, the diagnostic benefit of identifying a life-threatening condition like an abscess or bowel ischemia far outweighs the small, long-term risk from this level of radiation exposure.
| Imaging Study | Typical Effective Dose (mSv) | Comparison to Background Radiation |
|---|---|---|
| Chest X-ray (PA/LAT) | ~0.1 mSv | ~10 days |
| CT Abdomen/Pelvis (PV Phase) | 7-12 mSv | ~2-4 years |
| CT Chest (PE Protocol) | ~10-15 mSv | ~3-5 years |
Modern CT scanners use dose modulation techniques like auto-kVp and iterative reconstruction to minimize dose while maintaining diagnostic image quality. This protocol is standard for adults; pediatric protocols use significantly lower doses.
8. CT Abdomen and Pelvis (Portal Venous Phase) Imaging Protocol — Phases, Contrast, and Reconstructions
The “portal venous” name says it all: timing is everything. This protocol is designed to capture the moment of peak visceral and bowel wall enhancement, which occurs approximately 60-70 seconds after the start of a power-injected IV contrast bolus. This single-phase acquisition is sufficient for over 80% of general abdominal indications.
The table below outlines the key technical parameters for a standard protocol. Understanding these helps you troubleshoot image quality issues and know what to expect from the scan.
| Parameter | Specification | Clinical Pearl |
|---|---|---|
| Phase | Portal Venous | Scan starts 60-70 seconds after IV contrast injection begins. |
| IV Contrast | 100-130 mL (or 1.5 mL/kg) of 350-370 mgI/mL agent at 3 mL/sec | Ensure at least a 20-gauge IV is in place, preferably in the antecubital fossa. |
| Oral Contrast | Optional (600-1000 mL, 60-90 min prior) | Skip for acute pain/trauma to save time. Use for elective scans evaluating for fistula or leak. |
| Coverage | Domes of the diaphragm to the pubic symphysis | Always scroll up to check the lung bases. |
| Reconstructions | 5 mm axial (soft tissue & lung kernels), 3 mm coronal & sagittal | Always review the coronals for bowel obstruction and aortic pathology. |
A common pitfall is improper contrast timing or an inadequate bolus, leading to a poor-quality study. If the liver looks “flat” and the aorta is still much brighter than the IVC, the scan may have been acquired too early (late arterial phase). If the contrast has washed out of the kidneys and is dense in the bladder, it was likely too late. Always check the timing and image quality before starting your read.
9. The 3-Months-Free Offer for Radiology Residents and Fellows
3+ months free for radiology residents and fellows
We built GigHz Precision AI to solve the problems we faced as trainees: the pressure to be fast, the need to be accurate, and the desire to look like a rockstar on your reports. It lets you dictate your positive findings in free form, and the AI generates a complete, structured report using ACR and SIR templates. It helps you work faster without sacrificing quality.
All we ask in return is your feedback so we can keep improving the product for the next generation of trainees. Signup is simple—no credit card, no long forms. Just provide the following three items:
- Your PGY year (e.g., PGY-2, PGY-4)
- Your training type (radiology residency or fellowship specialty)
- Your training program / hospital name
To get started, apply for the residents free-access program and we’ll get you set up.
10. 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. It processes the clinical content of your dictation to structure the report, but patient identifiers are not needed.
Do I need my hospital’s IT department to set it up?
No. GigHz Precision AI is a secure, browser-based application. There is no software to install on hospital computers. It works on any modern web browser, including the one on your call-room computer or personal laptop.
Does it work with PowerScribe or other dictation systems?
Yes. It works alongside your existing PACS and dictation system. You can dictate into the GigHz web app, and then copy and paste the final, structured report directly into PowerScribe, Fluency, or any other RIS/EMR. It complements your existing workflow rather than replacing it.
Can I use it on my phone or iPad?
Yes. The platform is fully responsive and works on mobile devices and tablets. This is particularly useful for reviewing report drafts or using the tool when you’re away from your primary workstation.
Can I customize the templates?
Yes. While the system comes pre-loaded with standardized templates from governing bodies like the ACR and SIR, you can create, modify, and save your own custom templates to match your personal style or your institution’s specific requirements.
What happens after my residency or fellowship ends?
We offer continuity plans for graduating trainees who want to continue using the platform in their practice. Your custom templates and settings are saved to your account, so you can take them with you when you transition to being an attending.
Free GigHz Tools That Pair With This Article
Three free tools that complement the material above:
- ACR Appropriateness Criteria Lookup — Type an indication or clinical scenario in plain language and get the imaging studies the ACR rates for it, with adult and pediatric radiation levels. Built directly from 297 ACR topics, 1,336 clinical variants, and 15,823 procedure ratings.
- GigHz Imaging Protocol Library — A searchable library of 131 imaging protocols with the physics specs surfaced and the matching ACR Appropriateness Criteria alongside. Plain-English narratives readable in 60 seconds, organized by modality.
- GigHz Radiation Dose Calculator — Pick the imaging studies a patient has had and see total dose in millisieverts (mSv) with comparisons to natural background radiation, transatlantic flights, and chest X-rays. Useful for shared decision-making.
Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 7, 2026
