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CT scan, or Computed Tomography, combines x-rays with computer technology to create images of different bone and organ sections. Unlike standard x-rays which take a picture of the whole structure being examined, CT has the ability to image that same structure one “slice’ at a time. In standard x-rays, dense tissues like bones can block the view of the body parts behind them. In CT, the various slices clearly show both bone and underlying soft tissue. CT assists physicians in both diagnosis and detection of a variety of conditions at an early stage.
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CTA (Computed Tomography Angiography)
CTA, or Computed Tomography Angiography, is an examination that uses x-rays to visualize blood flow in arterial and venous vessels throughout the body, from arteries serving the brain to those bringing blood to the lungs, kidneys, and arms and legs. CTA is a patient-friendly procedure—contrast material is injected into a small peripheral vein by using a small needle or catheter. This type of exam has been used to screen large numbers of individuals for arterial disease. Most patients undergo CT angiography without being admitted to a hospital.
CT Scan Preparation - Instructions for Patients
Click here to view CT procedures that may not require any preparation depending on whether your doctor orders contrast.
Other CT procedures requiring special preparation are noted below.
Abdomen and Pelvis (with contrast)
Oral contrast 30 minutes prior for abdomen & 60 minutes prior for abdomen with pelvis.
The following CT scan examinations (denoted with an asterisk) require two hours of complete fasting prior to the procedure:
*Cervical Spine (with IV contrast)
*Chest and Abdomen (with IV contrast)
*Chest, Abdomen and Pelvis (with IV contrast)
*Extremity (with IV contrast)
*Head (with IV contrast)
*Internal Auditory Canals (with IV contrast)
*Kidney (with IV contrast) |
*Larynx (with IV contrast)
*Liver (with IV contrast)
*Lumbar Spine (with IV contrast)
*Renal (with IV contrast)
*Soft Tissue Neck (with IV contrast)
*Thoracic Spine (with IV contrast)
*CTA (CT Angiography) |
All other CT exams with no IV contrast do not require special preparation.
