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Chapter 02 Specialized Imaging Techniques
Chapter 02 Specialized Imaging Techniques
If an organ or material does not produce internal echoes on ultra sound it isconsidered to be what? -Correct answer -anechoic
What is an interaction that produces two high-energy photons (gamma rays) inopposite directions? -Correct answer -annihilation
What contains multiple parallel channels to allow x-rays to pass? -Correct answer-collimator
What imaging specialty produces cross-sectional tomographic images by firstscanning a slice of tissue from multiple angles with a narrow x-ray beam? -Correct answer -computed tomography (CT) What number is defined as the attenuation of a specific tissue relative to that ofwater? -Correct answer -CT number
What type of imaging relies on the movement of molecules and random thermalmotion? -Correct answer -diffusion imaging
What type of imaging equipment is designed to image two modalitiessimultaneously and integrate the images?? -Correct answer -direct fusion
What type of MRI allows the localization of specific regions of the brain thatcorrespond to various functions? -Correct answer -functional MRI (fMRI)
What is defined as spiral continuous motion? -Correct answer -helical What is a term used to make comparisons of echo intensities between adjacentstructures? -Correct answer -hyperechoic
What type of imaging requires software to fuse two imaging modalities? -Correctanswer -integrated imaging
What is a term used to describe two structures that have the same echogenicityeven though the tissue may not be the same? -Correct answer -isoechoic
What imaging specialty uses a strong magnet producing radiofrequencies atspecified intervals and recieves a return signal to produce an image. -Correct answer -magnetic resonance imaging (MRI) What imaging specialty is used to image the breasts and screen for breastcancers? -Correct answer -mammography
What imaging specialty uses radiopharmaceuticals to produce ionizing radiationthat is detected by a gamma camera to produce an image? -Correct answer - nuclear medicine What imaging specialty uses a radiopharmaceutical that emits a positron that themoving gamma camera detects to produce an image? -Correct answer -positron emission tomography (PET)
What two CT features adjust gray scale and brightness? -Correct answer -windowand leveling
MRI induces what type of atoms to alternate between high-energy and low-energy states? -Correct answer -hydrogen
MRI is the modality of choice for what 3 things? -Correct answer -CNS, spine, andmusculoskeletal conditions
Nuclear Medicine allows for the visualization of what type of processes? -Correctanswer -physiologic
What is the main benefit of nuc med? -Correct answer -detects diseases earlier Which imaging modality is used to look at the metabolic activity of an area? -Correct answer -PET
What are two forms of fusion imaging? -Correct answer -PET/CT and SPECT/CT is used to study patency of major blood vessels. -Correct answer -Doppler imaging The modality that combines digital images using hybrid equipment or specialequipment or special software. -Correct answer -Fused/Intergrated imaging
air, bone, barium -Correct answer -Acoustic Barriers
areas that appear black on a CT denoting air is. -Correct answer -Lowest CTnumber
High resolution images indicate that the thin sections must be? -Correct answer -2.0 mm or less
Multiple single scan CT equipment has been replace by what scanners -Correctanswer -Spiral Helical
The newest CT scanners have ______to produce 4 to 64 slices per scan rotation? -Correct answer -Multidectectors
Integrating all image data in CT by using software to produce 3-D images -Correctanswer -Volume rendered imaging
Fat tissue subacute hemorrhage and highly proteinaceous material cause a highsignal intensity appearing bright on MR -Correct answer -T1 weighted images
the most common pulsing sequence used in MRI today is? -Correct answer -T1-t2weighted image
Gadolinium chelates are used to visualize the blood vessels. -Correct answer -MRAngiography
The patient is injected or ingests the ionizing radiation through? -Correct answer -A radiopharmaceutical
The greatest difference in PET and SPECT is the type of? -Correct answer -Ionizingradiation emitted by radiopharmaceuticals.
