ASRT SEAL EXAM 9 QUESTIONS AND ANSWERS GRADED A+

ASRT SEAL EXAM 9 QUESTIONS AND ANSWERS GRADED A+ In CT perfusion imaging of the brain for a patient with a CVA, the ischemic brain tissue that is beyond repair is called the - Answers infarct core The range of displayed pixels values is decided by the selected - Answers window width The ____________ phase of kidney enhancement demonstrates peak opacification of the aorta and renal arteries - Answers arterial The quantity of information that can be contained within each pixel is the - Answers bit depth A newer type of reconstruction method which uses the shapes of the primary and remnant beams to generate an image with reduced noise is called - Answers model based iterative reconstruction The average time it takes for blood to pass through a given region of brain tissue is the - Answers mean transit time Filtration affects the radiation dose by - Answers removing low-energy photons from the beam before it reaches the patient The section interval is the - Answers space between each slice, section or image The _____________ is the table distance traveled in one 360 degree rotation of a helical scanner divided by the collimated width of the beam - Answers pitch The ability of the CT system to record spatial frequency and resolve objects is demonstrated by the - Answers modulation transfer function The human eye can differentiate _______ shades of gray - Answers 60 to 80 The tube housing and cooling oil contribute to ___________ filtration - Answers inherent Manufacturers use the ____________ when reporting typical CT scanner doses to the US FDA - Answers CTDI All of the following are benefits of effective communication except - Answers faster scan times What represents the HU of muscle - Answers 45 A single voxel may encompass more than one tissue type, in which case the system uses ___________ to assign the voxel a single CT number - Answers partial volume averaging When imaging the eye orbits, axial images are obtained parallel to the - Answers IOML Which CT system does not use moving parts - Answers Electron beam CT What is calculated by multiplying CTDIvol and the length of the zaxis - Answers DLP Dual energy CT scanning relies on - Answers applying two different kVp settings during a scan In CT exams of the chest, pitch must be adjusted based on the - Answers patients ability to hold respirations In CT imaging, the voxel depth is equal to the - Answers reconstructed section width Visualization of the tracheobronchial tree using 3D images and reconstruction is called - Answers bronchography