Study Guide RADIOLOGY - UMF

More documents

Recommendations

Info

Study Guide – Radiology – Faculty of Medicine - IV th Year 83. Does not belong to the indirect effects of X-ray radiation:a. Thompson effectb. Compton scatteringc. Materializationd. The photochemical effecte. Photoelectric effectAnswer: d
Study Guide – Radiology – Faculty of Medicine - IV th Year 9TOPIC 2. THE ROENTGEN DEVICETable of ContentsI. Main components. Functioning principles.II. Dedicated types of X-ray devicesIII. Sample questionsEducational objectives• The student must know:o The structure of an X-ray device• X-ray tube - vacuum container with 2 electrodes:• Cathode (-) - producer of electrons: molybdenum, tungsten• Anode (+): tungsten• Electrical circuit: Low and high voltage• The command / control system = control panel• The reception device• Ways of receiving:• Fluoroscopy - the principle of fluorescence• Radiography - the principle of phosphorescence• Types of receptors:• Analogues• Digitalo The operating principle• Cathode is connected to a low voltage electrical circuit whose role isto heat the cathode filament (2700K). By heating electron cloudaround the cathode• The role of the high voltage power circuit is to speed up the cloud ofelectrons to the anode• The anode is composed of a material containing atoms with large Zthat facilitate interaction between the incident beam and electrons onthe orbits of target atoms to generate X-ray• Phenomena occur in a vacuum containing glass enclosure, with wallslined with lead and that has a small unleaded slot = emission windowof the tube.o Analog fluoroscopy• Receiver: Direct screen (Zn sulfide, cesium iodide)• Fluorescent principle: emission of light occurs as long as the atom issubjected to incident radiation• Transparency = white (rays reach the screen, light-emissiondue to photoelectric effect)• Opacity = black (rays do not reach the screen)• Light amplifiers• Transforming light signal into electrical signal• Transfer on the TV monitoro Analog radiography• The receiver has several components• Antidiffusion grid: lead blades of Pb, control secondaryradiation• Case that contains:• Intensifier screens
Page 1 and 2: Study Guide - Radiology - Faculty o
Page 7: Study Guide - Radiology - Faculty o

Study Guide RADIOLOGY - UMF

Create successful ePaper yourself

Delete template?

Save as template?