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Vital Role of Government
Hospitals in Bahrain’s
Healthcare System
Computed Tomography Scanner (CT Scan)
CT or sometimes called Computerized Axial Tomography Scanner (CATS), uses special X-Ray equipment to obtain many images from different angles, and then join them together to show a cross-section of body tissues and organs. CT scanning provides more detailed information than do plain radiographs. It also can show bone, soft tissues, and blood vessels in the same CT images.
In CT, the X-Ray tube is rotated around the patient and the X-Ray beam impinges on an array of detectors as it emerges from the patient. The intensity of the transmitted beam at each angle is recorded. By a computer technique involving the solution of many simultaneous equations, a two-dimensional image is produced of an axial slice through the patient. The value of each pixel depends on the attenuation of the X-Ray beam by the small volume of the tissue that the pixel represents. As with conventional radiography, there is differential attenuation of the beam by tissues of different atomic weight and density.
With CT, very small differences in attenuation can be detected, allowing differentiation of soft tissue compositions. The Hounsfield scale is used, by convention, as a measure of radiation attenuation of tissue in CT. Water has a value of zero; soft tissues are usually in the range 20 to 60, whereas calcium is over 100, fat is in the range -40 to -80, and air is -1000. The advent of CT revolutionized diagnostic imaging of the central nervous system by allowing noninvasive imaging of intracranial structures. It has subsequently found many further application, especially in the mediastinum and retroperitoneum. The first CT scan in Bahrain was installed on 1st August 1985.
Procedure
Patients should wear comfortable, loose-fitting clothing for their CT exam. Anything that might interfere with imaging of the head - such as earrings, eyeglasses, dentures, or hairpins - should be removed.
No special preparation is needed for a CT scan of the head unless the patient has to receive a contrast material - a substance that highlights the brain and its blood vessels and makes abnormalities easier to see.
Precautions
CT involves exposure to radiation in the form of X-Rays, but the benefit of an accurate diagnosis far outweighs the risk. Special care is taken during X-Ray examinations to ensure maximum safety for the patient by shielding the abdomen and pelvis with a lead apron, with the exception of those examinations in which the abdomen and pelvis are being imaged. The effective radiation dose from a NC CT brain is about 2 mSv which is about 1 year's exposure from background radiation or equivalent to 100 chest X-Rays.
Women should always inform their doctor or X-Ray technologist if there is any possibility that they are pregnant. Scanning is NOT allowed for pregnant women. In some cases an alternative study will be performed to reduce or eliminate the radiation exposure to the fetus. Contrast materials contain iodine, which can cause a reaction in persons who are allergic. The radiologist also should know if the patient has asthma or any disorder of the heart or renal function.
Benefits
- CT examinations are relatively fast and of a reasonable cost especially when compared to MRI.
- The best imaging modality that provides detailed images of bone and calcification.
- CT is the modality of choice for rapidly screening trauma victims to detect internal bleeding or other life threatening conditions.
- Life support equipment can generally be easily used in the CT room; unlike MRI.
- Post processing, image evaluation & annotation, labeling, image rotating, measurements, magnification and reconstruction from axial images to 3D image, sagittal, oblique, coronal, etc.
- System components: the gantry system (the heart of the whole system - tilted 30 degree -/+), the operating console, the optical drive MOD magneto-optical disc for data storage & keyboard. Computer software and laser imager.
- Topogram frontal or lateral survey scan, similar to a conventional X-Ray exposure.
Location
Two Rooms for CT Scanners
Two Rooms for CT Scanners
Telephone Number CT Scan 1
17284034 (Ext.: 4034)
Telephone Number CT Scan 2
17284010 (Ext.: 4010)
Telephone Number CT Appointment Office
17284005 (Ext.: 4005)
Available Staff
Consultant Radiologists
CT inc-charge: Mrs. Kubra
Timing
7:00 am – 2:00 pm (on weekdays Sunday - Thursday)
+24 Hours (Radiologists & Radiographer on-call)
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