CT Orbits — Dictation, Appropriateness, and Dose for Residents

The Stat CT Orbits Read — From Trauma Bay to Final Report

Stat from the trauma bay. Polytrauma, facial smash. The CT orbits is up. Your attending is on the phone with the OMFS resident and wants to know one thing: is there a blowout fracture with entrapment? You’re scrolling through the coronals, trying to trace the inferior rectus muscle through the edema, while the ED keeps calling about the next scan. We’ve all been there. The pressure to be fast is immense, but the pressure to be right is absolute — missing entrapment or a retrobulbar hematoma has real consequences.

As a resident, I remember the checklist running through my head: floor, medial wall, roof, apex, muscles, optic nerve, globes. Forgetting one piece meant a potential addendum or a tough Q&A session at readout. This guide is built for those moments. It’s a framework for thinking through the CT orbits, ensuring you hit every key finding your attending (and the clinical team) expects. For more guides like this, check out the residents and fellows resource hub.

What a CT of the Orbits Covers and What Attendings Look For

A CT of the orbits is the workhorse for acute orbital pathology, especially trauma. While MRI owns the detailed evaluation of the optic nerves and soft tissue masses, CT is faster, better for bone, and essential for ruling out metallic foreign bodies. When an attending pulls up your preliminary read, they are looking for clear answers to specific clinical questions.

Your report should systematically address:

• Fractures: Is there an orbital floor or medial wall (lamina papyracea) blowout fracture? Is there evidence of muscle or fat herniation? Is there entrapment of an extraocular muscle?
• Foreign Bodies: Is there a foreign body present? Note its location, size, and material (e.g., hyperdense metallic vs. less conspicuous glass/plastic).
• Infection/Inflammation: In the setting of cellulitis, is it pre-septal or post-septal? Is there a drainable subperiosteal abscess? Is adjacent sinusitis the source?
• Masses & Proptosis: Is there a discrete mass? Are the extraocular muscles enlarged (as in thyroid eye disease)? Is the lacrimal gland abnormal?
• Optic Nerve & Globe Integrity: Is the globe ruptured? Is there a retrobulbar hematoma causing proptosis and stretching the optic nerve?

Radiology Report Template for CT Orbits

This template provides a reliable structure for your dictations. You can adapt it for your institution’s macros in PowerScribe or other voice recognition software. The key is to be systematic, ensuring no structure is overlooked.

Technique

Axial images were obtained through the orbits without intravenous contrast, with coronal and sagittal reformations. Comparison is made to [prior study] from [date].

(Modify as needed for contrast-enhanced studies: “following the administration of [X] mL of [contrast agent]…”)

Findings

Globes: Normal in size and configuration. No evidence of rupture. Anterior chambers are clear. Lenses are in normal anatomic position.

Optic Nerves: The optic nerves are symmetric and normal in caliber bilaterally. The orbital apices are unremarkable.

Extraocular Muscles: The extraocular muscles are symmetric and of normal size, without evidence of entrapment or enlargement.

Orbital Fat: No discrete soft tissue mass or inflammatory stranding.

Bony Orbits:

• Orbital Roof: Intact.

• Medial Wall: Intact. The lamina papyracea is preserved.

• Orbital Floor: Intact.

• Lateral Wall: Intact.

Lacrimal Glands: Unremarkable in appearance.

Paranasal Sinuses: The ethmoid, maxillary, frontal, and sphenoid sinuses are clear.

Intracranial Structures: Limited evaluation of the intracranial structures reveals no acute hemorrhage or mass effect.

Visualized Soft Tissues: Unremarkable.

Impression

1. No acute orbital fracture or foreign body.
2. No evidence of retrobulbar hematoma or orbital compartment syndrome.
3. Unremarkable evaluation of the globes, optic nerves, and extraocular muscles.

Free Radiology Template Sources

Building a personal library of templates is a rite of passage in residency. Before we discuss AI-driven tools, it’s worth knowing that two great free repositories exist, curated by and for radiologists. They are excellent starting points for creating your own macros.

• RadReport.org: Maintained by the RSNA, this is a comprehensive library of peer-reviewed templates covering nearly every modality and subspecialty. (https://radreport.org/)
• Radiology Templates (AU): An excellent, straightforward resource maintained by Australian radiologists with clean, practical templates for daily use. (https://www.radiologytemplates.com.au/home-page/)

The Next-Level Move: AI-Assisted Structured Reporting

The challenge with manual templates is the constant cutting, pasting, and editing of negative findings to report the positive ones. This is where AI-assisted dictation can streamline your workflow. Instead of navigating a template, you can simply dictate the positive findings in free form.

For example, you might dictate: “Comminuted fracture of the left orbital floor with herniation of orbital fat and the inferior rectus muscle into the superior aspect of the maxillary sinus. The muscle appears tethered.”

Tools like GigHz Precision AI are designed to parse this free-form dictation and automatically generate a complete, structured report. It places the fracture details under the “Bony Orbits” heading and the muscle finding under “Extraocular Muscles,” while populating the rest of the report with normal findings based on pre-loaded ACR and society-backed templates. This approach supports a more natural dictation flow while ensuring the final report is clean, comprehensive, and exactly what your attending expects to see.

When Should You Order a CT of the Orbits? ACR Appropriateness Criteria

The American College of Radiology (ACR) provides evidence-based guidelines to help clinicians choose the right study. For orbital imaging, CT is the clear first choice in several common scenarios.

Per the ACR Appropriateness Criteria for Orbits, Vision, and Visual Loss and Imaging of Facial Trauma, a CT of the orbits is Usually Appropriate for the initial evaluation of traumatic visual defects or suspected orbital injury. This extends to nearly all significant midface and frontal bone trauma scenarios where orbital involvement is a concern.

For nontraumatic presentations, CT also plays a key role. It is Usually Appropriate as the initial imaging for nontraumatic proptosis (exophthalmos) and suspected orbital cellulitis. In cases of cellulitis, a contrast-enhanced CT is crucial for differentiating pre-septal from post-septal disease and identifying a subperiosteal abscess that may require surgical drainage.

However, CT is not the first choice for everything. For suspected optic neuritis or when the primary concern is detailed characterization of a soft tissue mass, MRI of the orbits is rated as Usually Appropriate and is the preferred modality due to its superior soft tissue contrast.

How Much Radiation Does a CT of the Orbits Deliver?

Patients and ordering providers are increasingly aware of radiation dose. A typical CT of the orbits delivers an estimated effective dose of 1-3 mSv. To put this in perspective, this is roughly equivalent to the amount of background radiation a person receives over 6-12 months from natural sources.

The lens of the eye is a particularly radiosensitive structure, and modern CT scanners use dose modulation techniques and sometimes bismuth shielding to minimize exposure. While the dose is relatively low, it’s a key reason why MRI is preferred for non-acute conditions or for follow-up imaging in younger patients when bone detail is not the primary concern.

CT Orbits Imaging Protocol — Phases, Contrast, and Reconstructions

A high-quality CT orbits protocol is defined by thin slices and multiplanar reformats to fully evaluate the complex anatomy. The standard protocol is designed to maximize bone detail for trauma and provide sufficient soft tissue resolution for infection and masses. Most trauma protocols are performed without IV contrast, while evaluation for infection or mass requires it.

The coronal reformats are considered the gold standard for evaluating the orbital floor and are essential for identifying blowout fractures and muscle herniation.

A common pitfall is inadequate coronal reformats. If the patient’s head is tilted, the technologist must manually adjust the reformat plane to be perpendicular to the orbital floor. As the reading radiologist, always double-check the reformat quality, as a poorly angled plane can obscure a subtle floor fracture.

3+ months free for radiology residents and fellows

Want to look like a rockstar on your reports? We’re offering an extended free trial of GigHz Precision AI specifically for trainees. You can dictate your positive findings in free form, and the AI generates a complete, structured report using ACR and society-backed templates, with the appropriate Clinical Decision Support (CDS) firing automatically.

All we ask in return is your feedback so we can keep improving the product for residents and fellows on the front lines. The signup is simple — no credit card, no long forms. To get started, just provide these 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

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 GigHz Precision AI HIPAA-compliant?

Yes. The platform is designed for de-identified workflows by default. It operates on the anonymized text of your dictation and does not require Protected Health Information (PHI) to function. 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 application. There is no software to install on hospital machines. It works on any modern web browser, including the one on your call-room workstation or personal laptop.

Does this replace PowerScribe or other dictation systems?

No, it works alongside them. You dictate as you normally would. You can then paste your free-form dictation into the GigHz tool, which returns the structured report. You then copy that final, clean report back into your PACS/RIS for sign-off. It’s a supplementary tool designed to perfect the final output.

Can I use this on my phone or iPad?

Yes. Because it’s a web application, it’s accessible on any device with a browser, making it easy to use on the go or to review report structures away from a workstation.

Can I customize the templates?

Yes. While the system comes pre-loaded with ACR and society-standard templates, you can customize them to match the specific stylistic preferences of your attendings or institution.

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 year of practice.