Performing CT scan studies

Performing CT Scan Studies

Computed Tomography (CT) scanning produces detailed cross-sectional images of the body using X-rays and computer processing. CT is more sensitive than conventional X-ray and can detect smaller lesions, but involves higher radiation exposure. After acquiring CT images, results must be documented and stored in the system for radiologist interpretation.

Before you start

• The patient must have an active CT scan order in the system.
• You must be a certified CT technologist or trained CT operator.
• Ensure the CT scanner is functioning properly and has been quality-assured.
• Confirm the anatomical region, protocol, and whether contrast is ordered (e.g., "abdomen with IV contrast").
• Assess the patient for contraindications to contrast (allergy history, renal function) if contrast is planned.
• Explain the procedure to the patient, including potential breath-hold instructions and sensation during contrast injection.

Steps

1. Navigate to the Diagnostics & Laboratory section and locate the pending CT order. Open in Usystems

2. Verify patient identity using two identifiers before beginning the scan.

3. Screen for contraindications:

   • Ask about contrast allergy or reactions.
   • For renal insufficiency, confirm that contrast is still appropriate (consult with the radiologist if uncertain).
   • Confirm pregnancy status if applicable.

4. Position the patient on the CT table according to the protocol (e.g., supine for abdomen, prone for extremity).

5. Obtain a scout image (localizer) to confirm proper positioning and region of interest.

6. Administer contrast if ordered:

   • Verify the contrast type and dose match the order.
   • Use an IV injector if IV contrast is prescribed; allow time for circulation and distribution.
   • Follow your facility's timing protocol for optimal imaging.

7. Perform the CT acquisition:

   • Set scanner parameters (slice thickness, pitch, field of view) according to the protocol.
   • Instruct the patient on breath-hold if needed (e.g., "breathe in and hold" for chest/abdomen).
   • Acquire the helical or axial data as prescribed.
   • Monitor for patient comfort and adverse reactions during the scan.

8. Assess image quality and coverage in real time. If images are inadequate, repeat the scan as needed.

9. Document the study in the system:

   • Mark the study as Complete or Performed.
   • Record the date, time, and scanner used.
   • Note the protocol name and parameters (e.g., "5mm slices, non-helical").
   • Specify if contrast was used and type (IV, oral, rectal).
   • Add notes about any technical issues, patient motion, or repeat acquisitions.
   • Document patient tolerance and any adverse reactions.

10. Save the study. Images are transferred to PACS and made available for radiologist review.

What happens next

• CT images are archived in the imaging system (PACS).
• A radiologist reviews the images and writes an interpretation report.
• The report is added to the patient's medical record.
• The ordering physician is notified that results are ready.

Tips & common mistakes

• Radiation justification: CT uses ionizing radiation; always verify the order is clinically justified and that previous imaging is not available.
• Contrast timing is critical: improper timing can result in suboptimal enhancement and may require a repeat scan; follow your facility's protocols.
• Monitor for reaction: watch the patient during and immediately after contrast injection for signs of allergic reaction (rash, breathing difficulty, hypotension).
• Document everything: clear documentation helps the radiologist understand technical details and improves diagnostic accuracy.