CT Chest/Abdomen/Pelvis with IV Contrast — Dictation, Appropriateness, and Dose for Residents
New consult from GI: a 58-year-old with newly diagnosed colon cancer. The staging CT Chest/Abdomen/Pelvis just hit your list. This isn’t just a search for big, obvious liver mets. Your attending expects a systematic evaluation of every possible site of disease—regional nodes, peritoneal implants, lung nodules, adrenal masses, and bone lesions. It’s the kind of study where missing one small finding can change the patient’s stage from III to IV, completely altering their treatment and prognosis.
When I was a resident, the pressure on these reads was immense. You know there’s likely disease, but you have to find all of it. It’s about building a bulletproof report that the oncologists and surgeons can confidently take to tumor board. Let’s walk through how to structure your dictation to be comprehensive, efficient, and exactly what your attending is looking for. For more guides like this, check out our free trainee calculators and references.
What a CT Chest/Abdomen/Pelvis with IV Contrast Covers and What Attendings Look For
The contrast-enhanced CT of the chest, abdomen, and pelvis (CT CAP) is the workhorse of modern oncologic imaging. It’s a single acquisition, timed to the portal venous phase (about 60-70 seconds after contrast injection), which provides optimal enhancement of the solid abdominal organs like the liver, pancreas, and kidneys, as well as the bowel wall. This timing is crucial for detecting and characterizing metastatic disease.
This study is designed to answer critical questions for a wide range of clinical scenarios:
- Cancer Staging: Identifying the primary tumor, regional lymph node involvement, and distant metastases (e.g., liver, lung, bone).
- Cancer Restaging: Assessing response to therapy, detecting recurrence, or evaluating for surgical resectability.
- Sepsis Workup: Locating a source of infection when the origin is unclear after initial evaluation.
- Constitutional Symptoms: Investigating unexplained weight loss, fever of unknown origin (FUO), or fatigue where occult malignancy is a concern.
Your attending expects a report that systematically evaluates every organ system from the lung apices to the pubic symphysis. They’re looking for confidence and completeness. Don’t just describe the obvious primary tumor; methodically clear every other organ system to rule out metastatic spread.
Radiology Report Template for CT Chest/Abdomen/Pelvis with IV Contrast
This template provides a solid framework. Use it as a starting point for your macros in PowerScribe or your institution’s dictation system. The key is the systematic, organ-based approach in the Findings section.
Technique
CT of the chest, abdomen, and pelvis was performed with 100 mL of [Contrast Agent] intravenous contrast. Images were acquired in the portal venous phase. Axial images were reconstructed, with additional coronal and sagittal reformats provided for review. Comparison is made to the prior study of [Date].
Findings
Lungs and Pleura: The lung parenchyma is clear. No consolidation, suspicious nodule, or mass. No pleural effusion or pneumothorax.
Mediastinum: No mediastinal or hilar lymphadenopathy. The heart and great vessels are unremarkable. The esophagus is normal in caliber.
Liver: Normal size and contour. No suspicious hepatic lesion. The portal and hepatic veins are patent.
Gallbladder and Biliary Tree: The gallbladder is unremarkable. No intra- or extrahepatic biliary ductal dilatation.
Pancreas: Normal in appearance. No mass, fluid collection, or ductal dilatation.
Spleen: Normal in size and enhancement. No focal lesion.
Adrenal Glands: Unremarkable.
Kidneys and Ureters: The kidneys demonstrate symmetric nephrograms. No renal mass, calculus, or hydronephrosis. The ureters are normal in caliber.
Gastrointestinal Tract: The stomach, small bowel, and colon are unremarkable. The appendix is normal. No evidence of bowel obstruction or inflammation.
Peritoneum and Mesentery: No ascites, peritoneal nodularity, or mesenteric lymphadenopathy.
Pelvic Organs: The bladder is unremarkable. The uterus and ovaries (female) / prostate and seminal vesicles (male) are normal for age.
Bones and Soft Tissues: No suspicious osseous lesion. The visualized soft tissues are unremarkable.
Impression
- No CT evidence of acute intrathoracic, abdominal, or pelvic pathology.
- No evidence of metastatic disease.
Free Template Sources
Building a personal library of templates takes time. While our AI assistant is designed to streamline this process, two great free repositories exist for traditional, copy-pasteable templates that are curated by radiologists.
- RadReport.org: Maintained by the RSNA, this is a comprehensive library of peer-reviewed templates covering nearly every modality and subspecialty.
- Radiology Templates (AU): An excellent, well-organized collection of templates from Australian radiologists, often with practical, real-world formatting.
The Next-Level Move: From Free-Form Dictation to Structured Reports
The real bottleneck on call isn’t finding a template; it’s populating it accurately and efficiently when you have multiple positive findings. Instead of navigating a complex macro, you can dictate your findings naturally—”multiple low-density lesions in the right hepatic lobe consistent with metastases, the largest in segment 7 measures 3.2 cm”—and let an AI tool handle the structuring.
This is what GigHz Precision AI is designed to do. You dictate the positive findings in free form, and the AI generates a clean, structured report using pre-loaded templates from the ACR and SIR. It helps ensure all key elements are included and can automatically fire Clinical Decision Support (CDS) popups for classifications like LI-RADS or Bosniak when those findings are mentioned, guiding you to a compliant and complete impression.
When Should You Order a CT Chest/Abdomen/Pelvis with IV Contrast? ACR Appropriateness Criteria
The CT CAP is a high-radiation study, so ensuring it’s the right test for the clinical question is critical. The American College of Radiology (ACR) provides evidence-based guidelines for common scenarios.
For a patient with suspected or confirmed sepsis but no localizing signs or symptoms, a CT CAP with IV contrast is rated “Usually Appropriate” (ACR Sepsis panel). This rating holds true whether it’s the initial imaging study or performed after a nonspecific chest radiograph. When sepsis is suspected and the patient has acute abdominal pain, CT Abdomen/Pelvis is the primary modality, but extending to a full CAP is often justified.
In oncology, the CT CAP is a cornerstone. For staging of colorectal cancer for distant metastases, it is the standard of care and rated “Usually Appropriate” (ACR Gastrointestinal panel). For local staging of rectal cancer specifically, MRI is the preferred modality, but CT CAP is still required to evaluate the chest and abdomen. It’s also “Usually Appropriate” for initial staging of invasive breast cancer (clinical stage IIB-III and higher) and for surveillance after therapy for lung cancer when there is concern for distant metastatic disease.
Alternatives like PET/CT may be preferred for certain cancers where functional imaging adds significant value, while MRI is superior for detailed characterization of lesions in the liver, pancreas, or pelvis.
How Much Radiation Does a CT Chest/Abdomen/Pelvis with IV Contrast Deliver?
A standard CT CAP delivers an estimated effective radiation dose of 10-20 mSv. This is a significant dose, and the clinical indication must justify the exposure. To put this in perspective, it’s roughly equivalent to several years of natural background radiation.
Modern CT scanners use several dose-reduction techniques to keep the dose as low as reasonably achievable (ALARA). These include automated tube current modulation (which adjusts the mA based on patient thickness) and iterative reconstruction algorithms that produce high-quality images from lower-dose acquisitions. The target CTDIvol (CT Dose Index volume) is typically under 18 mGy for this study.
| Study / Exposure | Typical Effective Dose (mSv) |
|---|---|
| CT Chest/Abdomen/Pelvis | 10 – 20 mSv |
| Chest X-ray (PA/Lat) | ~0.1 mSv |
| Annual Natural Background Radiation (U.S.) | ~3 mSv |
CT Chest/Abdomen/Pelvis with IV Contrast Imaging Protocol — Phases, Contrast, and Reconstructions
This protocol is designed for a single, efficient acquisition that provides a comprehensive look at the chest and abdominopelvic viscera. The patient is positioned supine with arms raised. An 18-20 gauge IV is placed for power injection of approximately 100-125 mL of iodinated contrast at 3-4 mL/sec, followed by a saline flush.
The scan is timed to the portal venous phase using a bolus tracking technique. A region of interest is placed over the descending aorta at the level of the diaphragm. When the density reaches a threshold (e.g., 80-90 HU), a 40-second delay is initiated before scanning begins. This delay ensures optimal opacification of the portal vein and solid abdominal organs. The entire scan from lung apices to pubic symphysis is completed in a single breath-hold, typically lasting about 10 seconds on a modern scanner.
| Phase / Reconstruction | Timing | Slice Thickness | Key Parameters |
|---|---|---|---|
| Topogram (Scout) | N/A | N/A | kVp: 120 |
| Portal Venous Helical | ~60-70s post-injection | Source data | kVp: 100-120 (auto), mAs: 200-300 (auto), Pitch: ~1.0 |
| Soft-Tissue Chest Recon | From source data | 2-3 mm | Standard soft tissue kernel |
| Lung Recon | From source data | 1 mm | Sharp lung kernel |
| Soft-Tissue Abd/Pelvis Recon | From source data | 3-5 mm | Standard soft tissue kernel |
| Coronal & Sagittal MPRs | From source data | 2-3 mm | Reformatted from axial dataset |
A common pitfall to be aware of is the use of oral contrast. While historically common, many academic centers no longer use oral contrast for routine CT CAP studies, as modern scanners provide excellent bowel wall visualization with IV contrast alone. Its use is now typically reserved for specific indications like suspected fistula or abscess.
The 3-Months-Free Residents Offer
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Ready to give it a try? Apply for the residents free-access program and we’ll get you set up.
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.
Frequently Asked Questions
Is it HIPAA-compliant?
Yes. The platform is designed for de-identified workflows by default. You dictate findings without patient identifiers, and the structured text is generated for you to copy back into your HIPAA-compliant PACS or dictation system. No PHI ever needs to touch the platform.
Do I need IT to set this up?
No. GigHz Precision AI is browser-based and requires no installation or special permissions from your hospital’s IT department. It works on any computer or tablet you use in the reading room, including the call-room iPad.
How does this work with PowerScribe or other dictation systems?
It complements your existing system. You can use it side-by-side with your dictation software. After the AI generates the structured report text, you simply copy and paste it into your report in PowerScribe, Fluency, or your EMR. It streamlines the content creation, not the final sign-off.
Can I use it on my phone or iPad?
Yes, the platform is fully responsive and works on any device with a modern web browser, making it easy to use whether you’re at your main workstation or reviewing a case on a tablet.
Can I customize the templates?
Yes. While the system comes pre-loaded with standard ACR and society-backed templates, you have the ability to customize them to match your personal preferences or your institution’s specific formatting requirements.
What happens after my residency or fellowship ends?
We offer straightforward subscription plans for practicing radiologists. Your customized templates and settings will be saved, so you can transition seamlessly from your free trainee account to a professional plan if you choose to continue using the service in practice.
Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 7, 2026
