Computed tomography or CT Scan Procedure and facts,Details

One of the disadvantage of x ray radiography is superposition of images. Computed tomography technique developed in 1972. this a very sensitive technique to make the images of internal structures ,without any super positions . This method of imaging first invented by godfry housefield . he awarded nobel prize for this invention. The theoretical basis for this invention was gave by an Indian scientist gopalsamudram n ramachandran. In this technique a low dose x ray beam rotated around the body of the patient. The coming out rays are to be noted, by a sensitive detectors .in this method same body part examined in different angles .with the help of a computer the images are processed and analyzed. It can also give three dimensional views of organs. Doctors get a complete series of pictures .

Angiography

Angiography is a technique used to image the blood vessels. This technique gives the positions of block in blood vessels. The image in known as angiograph. The angiograph is taken of the organ ,and stored in a computer . a second angiograph is taken after contrast containing iodine , which is used to opaque x rays , the first image is subtracted from the second , give a clear picture of blood vessels.

C T Scan or Computed Tomography details

This is a computer based imaging technique . in this technique use X ray beams to produce cross section images of the body .the ct scan was developed by Godfry Hounsefield in 1972 .he awarded nobel prize for this invention. An Indian biophysicist Gopalasamudram N Ramachandran give the theoretical basis of this technique. The technique used to find dieases of brain , spinal cord , chest , abdomen etc. the tumors such as benigan and malignant tumors can be find out by this technique. Im ct scan a x ray emitting machine is rotated around the body region is to be examined .the x ray beam passed through the body in different angles . at the same time the x ray detector is rotated in opposite direction on the other side of the body .the tissues and body organs are varying thickness , they absorb x rays in different quantity. So the amount of x rays reaching at the detector is varied .the detector output is coupled to a computer where mathematically generates the image of the body parts. The advantage of ct scan is it gives three dimensional images.