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THE X-RAY UNIT

THE X-RAY UNIT. THE BASICS. WHAT FOUR COMPONENTS ARE IN TYPICAL RADIOGRAPHIC ROOM?. 1. X-RAY TUBE 2. OPERATING CONSOLE 3. HIGH VOLTAGE GENERATOR 4. X-RAY TABLE. OVERHEAD Ceiling suspension Sets of rails-controls longitudinal/transverse positioning

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THE X-RAY UNIT

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  1. THE X-RAY UNIT THE BASICS

  2. WHAT FOUR COMPONENTS ARE IN TYPICAL RADIOGRAPHIC ROOM? 1. X-RAY TUBE 2. OPERATING CONSOLE 3. HIGH VOLTAGE GENERATOR 4. X-RAY TABLE

  3. OVERHEAD Ceiling suspension Sets of rails-controls longitudinal/transverse positioning Telescoping column for controlling vertical distance. FLOOR Tube-support column mounted on floor Same positioning options as overhead Counter weight on back of telescoping column. Why? THE X-RAY TUBEChapter 6 in Bushong

  4. OTHER COMPONENTS ON X-RAY TUBE • Collimator light • Collimator controls • Transverse lock • Horizontal lock • Longitudinal lock • Vertical lock • Tube head lock • Tape Measure

  5. C-arm • Protective housing • Isotrophically • Window • Useful beam • Leakage • Acceptable level of leakage is….?

  6. CHAPTER 5 What is the typical voltage range? What is the typical current range?

  7. X-RAY TABLE • Must be radiolucent • Can be tilted • Float • Holds bucky • Has weight limit of 300lbs(Carbon-fiber) • Easily cleaned, hard to scratch and without crevices

  8. X-RAY CONSOLE • Allows the radiographer to control the x-ray tube current (mA) and the voltage (kVp) so that a useful image is produced. • ? Controls the quantity • ? Controls the quality • What does a line voltage compensator do?

  9. AN R/F ROOM • Contains a radiographic unit • Contains a fluoroscopic unit • located under radiographic table • used in studies where it is necessary to watch a procedure on a monitor using x-rays.

  10. HIGH VOLTAGE GENERATOR Housed within the x-ray room

  11. Mobile radiography

  12. mAs AND THE IMAGE ON THE FILM Fauber pgs 51-53 • What is mAs? • mAs = the mA X exposure time • mAs is the quantity of x-rays • mAs produces the overall blackening(DENSITY) on the film or brightness on filmless image receptors • Pg 53-note the relationship between density and brightness

  13. kVp and the image produced on the film (pgs 53-57) • What is kVp? • Controls the quality or penetrating quality of the x-ray beam • Produces the varying shades of gray on the film. (variations of brightness and density) • Gray scale • Long or low and short or high contrast

  14. Anatomic part and contrast • Range of densities • Tissue composition • Pgs 57-58

  15. Intro to Digital ImagingFauber and Carter • Carter pgs 80-82 • Does KVP matter anymore? • Does mAs matter anymore?

  16. Density Contrast ------------------------ Spatial resolution Recorded detail Size/Shape distortion Overall blackness Difference between adjacent densities ----------------------- Smallest object detected (DR) Sharpness of the lines of an image Misrepresentation of the true size or shape of image Four radiographic qualities

  17. Controlling and influencing factors • What might control or influence the four radiographic qualities? • Density • Contrast • Recorded detail • Distortion • Images 4-28,4-29, 4-30, 4,31 pg 104 Fauber • Images 5-11, 5-15, Figure 5-16, all images on pg 130-131 Fauber

  18. Sharpness vs. Visibility • Driving on a foggy night (visibility) • Driving after having drops in your eyes (Sharpness)

  19. Good images vs Bad images • Over exposed • Over penetrated • Poor detail • distortion

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