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CT ( X-Ray Computed Tomography ) - Luan M, James C, Peter (Thien) T.

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Thien Tran

on 30 April 2011

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Transcript of CT ( X-Ray Computed Tomography ) - Luan M, James C, Peter (Thien) T.

X-Ray Computed tomography CT SCAN What is CT Scan? X-ray computed tomography is a medical imaging method used to generate a three-dimensional image of the inside of an object. How does CT Scans work? CT uses a computer and a rotating x-ray device to form 2D X-ray images taken around an axis of rotation and create detailed, cross-sectional images of objects. Advantages/ Disadvantages Advantages-

Painless and accurate.
Able to image bone, soft tissue and blood vessels all at the same time.
CT scanning provides very detailed images of many types of tissue as well as the lungs, bones, and blood vessels.
Fast and simple; in emergency cases, they can reveal internal injuries and bleeding quickly enough to help save lives.
Shown to be a cost-effective imaging tool for a wide range of clinical problems.
Less expensive than MRI. In addition, it is less sensitive to patient movement.
CT can be performed if you have an implanted medical device of any kind, unlike MRI.
CT imaging provides real-time imaging, making it a good tool for guiding procedures particularly the lungs, abdomen, pelvis and bones.
No radiation remains in a patient's body after a CT examination.
X-rays used in CT scans usually have no side effects.
Medical Physics James, Luan, Thien Disadvantages-

There is always a slight chance of cancer from radiation.
The effective radiation dose from this procedure is about 10 mSv, which is about the same as the average person receives from background radiation in three years.
Women should always inform their physician or x-ray technologist if there is any possibility that they are pregnant.
CT scanning is, in general, not recommended for pregnant women because of potential risk to the baby.
Nursing mothers should wait for 24 hours after contrast material injection before resuming breast-feeding.
The risk of serious allergic reaction to contrast materials that contain iodine is rare, and radiology departments are well-equipped to deal with them.
Cost concerns CT image of the lungs. The white arrow indicates a lung tumour. Chest x-ray from the side. Explanation of Physics Principles used in CT Scans Radiology/ Radiation are the Physics principles involved in CT Scans.
It has been revolutionised the imaging of many body parts, especially with soft-tissue structures which are difficult to show using conventional radiography techniques.
The physics of CT scanning is complex and this appendix merely attempts an overiew which will allow the reader to understand the simple prinicples of the process.
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