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Computed tomographic angiography, head, with contrast material(s), including noncontrast images, if performed, and image postprocessing

CPT4 code

Name of the Procedure:

Computed Tomographic Angiography (CTA), Head, with Contrast Material(s), including Noncontrast Images and Image Postprocessing


Computed Tomographic Angiography (CTA) of the head is a diagnostic imaging procedure that uses X-ray technology and contrast materials to create detailed images of the blood vessels in the head. It is often used to detect and evaluate vascular conditions, such as aneurysms or blockages.


The primary purpose of a head CTA is to diagnose and assess conditions affecting the blood vessels in the head, such as aneurysms, stenosis, or other vascular abnormalities. It helps in planning treatment strategies and monitoring the success of interventions.


  • Symptoms such as severe headache, dizziness, vision problems, or neurological deficits.
  • Suspected aneurysms or vascular malformations.
  • Evaluation of head trauma.
  • Pre-surgical planning or post-surgical monitoring.
  • Stroke assessment and management.


  • Patients may need to fast for a few hours before the procedure.
  • Discontinuation of certain medications might be required.
  • Patients should inform their doctor about any allergies, especially to contrast materials or iodine.
  • Pre-procedure assessment including blood tests or kidney function evaluation might be necessary.

Procedure Description

  1. The patient lies on a motorized table that slides into the CT scanner.
  2. Initial noncontrast images are taken.
  3. A contrast dye is injected through an intravenous line to highlight blood vessels.
  4. The CT scanner captures detailed images of the head as it rotates around the patient.
  5. Advanced computer software processes the images to provide a comprehensive view of the head's blood vessels.


The entire procedure typically takes about 30-60 minutes, including preparation and image postprocessing.


The procedure is performed in a radiology department within a hospital or an outpatient imaging center.


  • Radiologist: A doctor specializing in interpreting medical images.
  • Radiologic technologist: Operates the CT scanner and assists with positioning the patient.
  • Nursing staff: Provides patient care before, during, and after the procedure.

Risks and Complications

  • Exposure to radiation: Though low, there is a minimal risk associated with the use of X-rays.
  • Allergic reaction to the contrast dye: Rare, but possible.
  • Kidney function impairment: Particularly in patients with preexisting kidney issues.
  • Injection site complications: Pain or infection where the IV is placed.


  • Provides detailed images of blood vessels in the head.
  • Noninvasive and relatively quick.
  • Helps in early diagnosis and treatment planning, potentially preventing serious complications like stroke.


  • Most patients can resume normal activities immediately after the procedure.
  • Drink plenty of fluids to help flush the contrast dye from the body.
  • Follow any specific instructions given by the healthcare provider.
  • A follow-up appointment might be necessary to discuss the results.


  • Magnetic Resonance Angiography (MRA): Uses magnetic fields instead of X-rays, suitable for patients allergic to contrast dyes.
  • Doppler Ultrasound: Noninvasive but less detailed.
  • Conventional angiography: More invasive and often reserved for therapeutic interventions.

Patient Experience

  • Patients might feel a warm sensation when the contrast dye is injected.
  • Lying still on the table can be uncomfortable but is essential for clear images.
  • Pain is minimal; discomfort is usually associated with the injection site.
  • Most patients experience no significant post-procedure symptoms and can go home shortly after the procedure.

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