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

THE X-RAY TUBE Chapter 7 in Bushong 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?

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

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

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

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

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?

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.

HIGH VOLTAGE GENERATOR Housed within the x-ray room

Mobile radiography

mAs AND THE IMAGE ON THE FILM Fauber pgs 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

kVp and the image produced on the film (pgs 67,80-84) What is kVp? Controls the quality or penetrating quality of the x-ray beam Produces the varying shades of gray on the film.

Anatomic part and contrast Range of densities Tissue composition Page 88, figure 4-19,

Intro to Digital Imaging Fauber and Carter Pg Fauber What are some areas to be aware of? Carter pgs Does KVP matter anymore? Does mAs matter anymore?

Radiographic Qualities Photographic Geometric Allow us to see image –Density and Contrast Produce a sharp image –Recorded detail and distortion

Four radiographic qualities Density Contrast Fauber Chapter 5 Recorded detail Distortion Overall blackness Difference between adjacent densities Sharpness of the lines of an image Misrepresentation of the true size or shape of image

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 Fauber

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

Good images vs Bad images Over exposed Over penetrated Poor detail distortion

REVIEW MODULES 2 AND 3 RADIOGRAPHIC DENSITY AND CONTRAST COMPLETE MODULE 2: RADIOGRAPHIC DENSITY EXAM MODULE 3: RADIOGRAPHIC CONTRAST EXAM HOMEWORK