sir godfrey hounsfield• Brain CT 1972-73• Whole body CT 1975
Ct scan: basic• Also known as CT or CAT scan.• Uses x-rays to make detailed pictures of the structure inside the body.• During the scan you will lie on a table that is attached to the scanner.• Large doughnut shaped machine
CT scan: Basic• CTs primary beneﬁt is the ability to separate anatomical structures at different depths within the body.• A form of tomography can be performed by moving the X-ray source and detector during an exposure.
Ct scan: Basic• Anatomy at the target level remains sharp, while structures at different levels are blurred.• By varying the extent and path of motion, a variety of effects can be obtained, with variable depth of ﬁeld and different degrees of blurring of out of plane structures
Computed tomography scan is an useful machinewhich can see diagnosis of the disease on the patientwhere others examination still did not see clear. A patient is receiving a CT scan for cancer. Outside of the scanning room is an imagine computer that reveals a 3D image of the body’s inner area.A patient is moving during the scan, so the picture gets blurring.That is why you may be asked to hold your breath during thescanning.Any motion, whether breathing or body movements can lead toartifacts on the image.
Benefits by using ct scan• It’s painless, noninvasive and accurate.• It’s fast and simple; e.g in emergency cases, they can reveal internal injuries and bleeding quickly enough to help save lives.• Less sensitive to patient, than MRI• After CT examination no radiation remains in patient’s body.
Risks by using ct scan• Always a slight chance to get cancer.• In general, CT scan is not recommended for pregnant women unless medically necessary because of potential risk to the baby.• There is a chance of allergic reaction to the dye.