Medical Devices Technology Lab Lecture One PDF

Ministry of Higher Education and Scientific Research Islamic University College of Medical Technology Department of Radiology Technology Medical Devices Technology Lab Second Stage...

Ministry of Higher Education and Scientific Research Islamic University College of Medical Technology Department of Radiology Technology Medical Devices Technology Lab Second Stage Lecture one Asst.let Ali Hatif Shomraan Asst.let Murtadha Ali Hamoozi Asst.let Mohammed Dhehyaa Shareef  The operating console The operating console is the apparatus that allows the technologist to control the x – ray tube current ,voltage and to make an exposure, so that useful x – ray beam of a proper intensity and penetrability is attained to produce a good quality radiograph. Radiation quantity refers to the number of x-rays or the intensity of the x-ray beam. Radiation quantity is usually expressed in milliroentgens (mR) or milliroentgens/milliampere-second (mR/mAs) Radiation quality refers to the penetrability of the x-ray beam and is expressed in kilovolt peak (kVp). Figure1: operating console. 1- Voltage compensator control (Line Compensation) The line compensation incoming voltage so that a constant voltage may be used during exposure and not a varying voltage. Most x-ray machines are designed to operate on a 220 V power source, although some can operate on 110 V or 440 V 58  Figure 2: line compensator 2-Autotransformer Receives power from the line compensator and provides power to the high voltage and filament circuits. 3- KVp adjustment Kilovoltage peak (KVp) is the peak potential applied to the x-ray tube, which accelerates electrons from the cathode to the anode in radiography or computed tomography. 4-mA control is a measure of radiation produced (milliamperage) over a set amount of time (seconds) via an x-ray tube. It directly influences the radiographic density, when all other factors are constant. 5- Exposure timer This affects how long the x-rays are being produced for. The longer the exposure, the more photons are released and the more radiation hits the patient and thus the plate.underneath operating console