Hematology Oncology Associates
   

 

CT Scan

A CT scan also called CT or computerized tomography is an X-ray technique that produces images of your body that visualize internal structures in cross section rather than the overlapping images typically produced by conventional X-ray exams.

Conventional X-ray exams use a stationary X-ray machine to focus radiation on a particular area of the body to produce 2-D images much like a photograph.  CT scans use an X-ray that rotates around your body and a powerful computer to create cross section images, like slices, of the inside of our body.

Your doctor may recommend a CT scan to help:

  • Diagnose muscle and bone disorders, such as bone tumors
  • Pinpoint the location of a tumor, infection or blood clot
  • Detect and monitor diseases such as cancer or heart disease

During a CT scan, you lie on a table inside a doughnut-shaped machine called a gantry.  An X-ray tube inside the machine rotates around your body and sends small doses of radiation through it at various angles.  As X-rays pass through your body different tissues absorb different amounts of radiation.  The computer then assembles the images and displays them on a computer monitor.

You can expect a CT scan to last from 30 minutes up to an hour, depending on the preparation needed and whether it includes the use of a contrast medium.  After the exam you can return to your normal routine.  If you are given a contrast medium our technologist performing the scan may give you special instructions.  You may be asked to wait a short time in the department to ensure that you feel well after the exam. 

CT images are stored as electronic data files and usually reviewed on a computer.  A radiologist interprets these images and sends a report to your doctor.

Be sure to inform your doctor if:

  • You are pregnant
  • You have asthma or allergies.  There is an increased risk of a reaction to the contrast medium
  • You have certain medical conditions: diabetes, asthma, heart disease, kidney problems or certain thyroid conditions may increase your risk of a reaction to contrast medium.