X-ray Fundamentals and Imaging/Positioning Exam 1 Radiologic Physics RADT 100 With Correct Answers

X-ray Fundamentals and Imaging/Positioning Exam 1 Radiologic Physics RADT 100 With Correct Answers adduction - ANS: Movement toward the midline of the body Abduction - ANS: Movement away from the midline of the body What is the purpose of chest positioning in a PA X-ray? - ANS: To minimize scatter by using a bucky Why is scatter minimized in a PA X-ray? - ANS: To prevent 'fogging' of the image Why are chest x-rays done upright? - ANS: Prevent engorgement of vessels Lower diaphragm Demonstrate air/fluid levels (particularly in the costophrenic angles) Why are chest x-rays done at 72 SID - ANS: To allow for large FOV To reduce heart magnification Why are chest x-rays done PA? - ANS: Done PA to get heart in closer contact with IR (reduce magnification of the heart/reduce OID between heart and IR) For PA - ANS: CR centered to MSP and T7 for PA o MSP is perpendicular and MCP is parallel o Check for rotation at the sternoclavicular joints (need to be equidistant from the c-spine shadow) For lateral - ANS: CR centered to MCP and T7 for left lateral o MSP is parallel and MCP is perpendicular o Check for rotation at the posterior ribs (need to be superimposed) Chest x-ray breathing instructions - ANS: On deep inspiration, expose after 2nd breath Lordotic x-ray - ANS: Done in the bucky so that scatter is minimized (larger part produces more scatter which could "fog" the image) How is lordotic x-ray performed - ANS: AP to allow patient to lean back