Part 3 Flashcards
What is the series of blood-flow related events that occur from the beginning of one heartbeat to that of the next?
Cardiac Cycle
What is a common measurement during CT perfusion studies of the brain?
Cerebral Blood Flow (CBF)
What is CBF?
Cerebral Blood Flow
What is the quantity of blood (mL) that moves through 100 g of brain tissue each minute?
Cerebral Blood Flow (CBF)
What is the normal range of gray matter?
50 to 60 ml/100 g/min
What is a common measurement during CT perfusion studies of the brain?
Cerebral Blood Volume (CBV)
What does CBV stand for?
Cerebral Blood Volume (CBV)
What is the quantity of blood (mL) contained within a 100-g of brain tissue?
Cerebral Blood Volume (CBV)
Cerebral Blood Volume (CBV) is the quantity of blood (mL) contained within a 100-g of brain tissue. What is normal range?
4 to 5 mL/100g
What is the level of blood flow throughout brain tissue?
Cerebral Perfusion
What is the produce of milliamperage (mA) and scan time (seconds) utilized for a CT acquisition?
Constant mAs
What does mA stand for?
millamperage
What are CT images acquired with equal section thicknesses and reconstruction intervals?
Contiguous Images
What is the ability of a CT system to detect an object with a small difference in linear attenuation coefficient from the surrounding tissue?
Contrast Resultion
What can also be referred to as: low-contrast detectability or sensitivity?
Contrast Resolution
What is a substantial decline in renal function that can occur after a patient receives IV contrast material?
Contrast-Induced Nephrotoxicity (CIN)
What does CIN stand for?
Contrast-Induced Nephrotoxicity (CIN)
What is usually signified by a marked increase in serum creatinine over a baseline measurement obtained prior to contrast agent administration?
Contrast-Induced Nephrotoxicity (CIN)
What is the mathematical filtration used by the CT system to remove blurring artifact during the back-projection method of image reconstruction?
Convolution
What is a late arterial phase of renal enhancement beginning 30 to 40 seconds after the initiation of contrast agent administration?
Corticomedullary Phase
When does optimal enhancement of the renal cortex and renal veins occur?
During the Corticomedullary Phase
What is a waste product of metabolism found in the bloodstream and measured as an indicator of renal function?
Creatinine
What is the normal range of creatinine?
0.5 to 1.5 mg/dL
What is the CT evaluation of a joint after the intra-articular injection of iodinated contrast material?
CT Arthrography
What is the specialized MSCT examination of the tracheobronchial tree consisting of MPR and volume-rendered 3D images reconstructed from thin, overlapping MDCT axial images through the airways?
CT Bronchography
What is a specialized CT evaluation of the large intestine used primarily for colon cancer screening?
CT Colongraphy
What specialized CT evaluation of the large intestine is extended and scanned with thin-section CT?
2D and 3D models are constructed, including virtual endoscopic fly-through views.
CT Colongraphy
What is a specialized CT examination of the bladder whereby iodinated contrast material is administrated directly under gravity into the bladder via Foley catheter?
CT Cystography
What is the approximate measure of the radiation dose received in a single CT section or slice?
CT Dose Index (CTDI)
What does CTDI stand for?
CT Dose Index (CTDI)
What is a specialized CT evaluation of the small bowel whereby enteral contrast material is administered directly into the duodenum through a nasogastric catheter placed under fluoroscopic guidance?
CT Enteroclysis
What is a specialized CT evaluation of the small bowel after the oral administration of low-density (0.1%) barium?
CT Enterography
What percentage is low-density barium?
0.1%
What is continuous, real-time CT imaging used predominantly for CT-guided interventional procedures?
CT Fluoroscopy
CT evaluation of the spinal cord and nerve roots after the intrathecal administration of iodinated contrast material?
CT Myelography
What is the relative value assigned to each pixel to quantify the attenuation occurring in each voxel in comparison with the attenuation of water?
CT Number
The calculated CT number for a given pixel is given in?
Housfield Units (HU)
What does HU stand for?
Housfield Units (HU)
What may also be referred to as Pixel Value?
CT Number (Hounsfield Units {HU})
What is the CT angiographic assessment of the peripheral arterial tree from the renal arteries through the lower extremities?
CT Runoff
What is the process of obtaining anatomic information with CT imaging that is used to calculate the beam arrangement for radiotherapy?
CT Simulation
What is a comprehensive, multiphasic CT evaluation of the urinary tract?
CT Urogram
What primarily consists of pre-contrast, post-contrast, and delayed CT acquisitions through the kidneys, ureters, and bladder?
CT Urogram
What is commonly referred to as a CT-IVP?
CT Urogram
What is an error occurring in the superior portion of the skull, where dense bone averages with the low-attenuating brain tissue?
Cupping Artifact
What partial volume artifact may result in abnormally dense-appearing brain parenchyma?
Cupping Artifact
