Diagnostic Imaging

Question	Answer
What are the various types of imaging?	Radiography, CT scan, scintigraphy, MRI, ultrasound
What are the differences between hyperechoic, hypoechoic, and anechoic?	Hyperechoic: more echogenic, brighter than normal; higher in density Hypoechoic: less echogenic, darker than normal; lower density Anechoic: not echogenic, appears black
What are the three requirements for an x-ray?	Source of electrons, method of accelerating electrons, and a target with which they can collide
What is a contrast media and the different types?	Contrast media are inert compounds that are visible radiographically. Positive: appear white on rads Negative: gases used to distinguish lumen Double: positive and negative
What is kVp and how does changing it affect the x-ray?	kVp (kilovoltage peak): high voltage across x-ray tube Changes affect the film contrast: High contrast (65 kVp) under penetrates tissues; Low contrast (80 kVp) over penetrates tissues
What is mA and how does changing it affect the x-ray?	ii. mAs (current x time): total number of electrons crossing the x-ray tube; Changes affect the film density; High mA: can have low exposure time Low mA: must have a higher exposure time
What is the primary beam?	Primary Beam: x-rays from target follow a defined path

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	Created by sportycanine about 10 years ago