USAHS imaging Exam Questions with Correct Answers

USAHS imaging Exam Questions with Correct Answers When something is ______________ it appears to be black because the X-rays are able to pass through with little resistance. - Answer-Radiolucent When something is ___________ it appears to be white/light grey because the X-rays are blocked. - Answer-Radiodense When something is _____________ it appears white because no X-rays can pass through. Examples include metals/ injected dyes. - Answer-Radio-opaque What is more radio-dense cortical bone or cancellous bone? - Answer-Cortical What is more radio-dense bone or muscle? - Answer-Bone What is more radio-dense muscle or fat? - Answer-Muscle What is more radio-dense water or fat? - Answer-Water Short exposure time and low milliamperes on an X-ray _______________ radiodensity. - Answer-Increase Standard distances from the X-ray tube for the best quality are ____ inches for skeletal and ____ inches for the chest. - Answer-40, 72 ______ is the modality of choice for viewing bone, the best for evaluating loose bodies and subtle/complex fractures. Also the best for the evaluation of spinal degeneration. - Answer-CT ______ does not use radiation. This is the superior method for soft tissue detail and certain bone pathologies. - Answer-MRI How does MRI produce images? - Answer-From the emission of energy from the protons in the body (NOT from the absorption of X-rays) T1 imaging signal is caught ______ emphasizing fat. - Answer-Early T2 imaging signal is caught ______ emphasizing fluid. - Answer-Late In a T1 MRI the ______ is bright - Answer-Fat (in T2 the fluid is bright) How can you use the cortex of a bone to determine if it is a CT scan or MRI? - Answer-If they cortex of the bone is bright it is a CT scan