الفهرس 
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Abstract
After a physian has obtained his clinical history and performed a thorough physical examination he defines for himself certain pathophysiologicct.L
disturbances in his patient. In sorting these out, he virtually makes an outline to opproach a definitive diagnosis. In so doing, he evolves aplan for action sometimes ref ered to as an flgorithm in which adecision formed. Some aspects of this format involve clinical pathology or other similar tests whereas in over one half of his patients he will most likely decide to resort to one or another method of diagnostic imaging.
The discovery of a new type of radiation by Roentgen in 1895 had a profound impact on science in general and on the practice of medicine in particular, one of its revolutionary effects was in the field of diagnosis and especiallyin G,I.T0 Pfahler
Diagnostic imaging basically involves three technologies:
1. The transmission of ionizing radiation through an organ or anatomic part — and a record made 0±’ the beam emitted on film acathode ra oscilloscope or a television.
2. The emission of ionizing radiation from the patient after he had an injection of an appropraite pharma ceutical6 the emitted image is recorded on aspecial camera device and a photograph is rendered by this camera (Nu.chlear medicine)0
3. The passage of sound beam through the body or anatomic part with a recording of the reflected echo (Ultrasound).