PET/CT Terms CT Registry Review

Question Answer
Method for reducing artifacts in the PET image. In PET, loss of counts can occur because of anomalies in attenuation, scatter and random image noise, artifacts, & distortion. With PET/CT, data from CT can be used for ___ of PET emission data, saving time attenuation correction
Pharmaceuticals used to reduce motion artifact on cardiac CTA images by temporarily lowering a patient's heart rate B-blockers
The amount of calcification on cardiac CT calcium score
CT techniques that attempt to minimize cardiac motion in the study by selecting (or acquiring) images during cardiac segments with relatively low cardiac motion. ECG tracings are acquired with scan acquisition cardiac gating
Principle that states cerebral blood volume can be calculated as the product of the total cerebral blood flow and the time needed for the cerebral blood passage. CBF = CBV/MTT central volume principle
Optical storage devices; can be used for long-term data storage. This has a storage capacity of 700 megabytes compact discs (CD)
An imaging characteristic regarding how quickly the iodinated contrast is washed out of the adrenal gland. It can be used to differentiate adenomas from metastases; relies on physiologic differences in perfusion contrast washout
The phase of renal enhancement that follows the portal venous phase that typically occurs approximately 30 to 70 seconds after the IV administration of a bolus of contrast material corticomedullary phase
CT technique used to visualize the arterial and venous vessels throughout the body. Scans are performed in the helical mode with a high flow rate contrast injection CT angiography
CT method that provides a qualitative and quantitative evaluation of cerebral perfusion. ____ provides this information by calculating regional blood flow (rCBF), regional blood volume (rCBV), and mean transit time (MTT). CT brain perfusion
An add-on option for some scanners. Often used for CT-guided interventions. Allows for the near real-time capabilities of traditional ____ while maintaining the superior contrast resolution and 3D anatomic display of CT CT fluoroscopy (CTF)
Modification of CTA that is used for the depiction of venous anatomy. Scan parameters are similar to CTA, except images are acquired while contrast is in the venous enhancement phase CT venography
A direct plane is one that can be obtained by positioning the patient in a specific position. For foot, this is defined as the plane parallel to the plantar surface of the foot direct axial plane
Method developed to address concern about the radiation dose from retrospective ECG gating methods in CT. The tube current is automatically decreased during the systolic phase of the ECG tracing ECG-pulsed tube current modulation
The phase of renal enhancement that follows the nephrogram phase that typically occurs approximately 3 minutes after the IV administration of a bolus of contrast material and can last 15 minutes or longer excretory phase
Radiotracer that has played a key role in advancing PET based on the fact that malignant tumors often favor the glycolytic pathway for metabolism Fluorine-18 fluorodeoxyglucose
The first phase of enhancement typically occurring 15 to 25 seconds after the IV administration of a bolus of contrast material hepatic arterial phase
Method used to reduce the radiation dose during CT fluoroscopic procedures. Consists of alternating ceasing and beginning the radiation exposure rather than the continuous use of the fluoroscopic mode throughout the procedures intermittent fluoroscopy
Any methodology that investigates events at the molecular and cellular levels molecular imaging
Devices that hold needles during a CT fluoroscopic procedure to avoid the hand of the doc/tech entering the CT beam needle-holding device
The phase of renal enhancement that follows the corticomedullary phase that typically occurs approximately 100 to 120 seconds after IV administration of a bolus of contrast material nephrogram phase
Interventional procedures in which access to inner organs or other tissue is done via needle puncture of the skin percutaneous procedures
The attenuation correction feature that is built into a dedicated PET system (i.e., one that does not include a CT component) PET transmission scan
Includes study of the mechanisms of absorption & distribution of an administered drug, rate at which a drug action begins & the duration of the effect, the chemical changes of the substance in body, & effects & routes of excretion of metabolites of drug pharmacokinetics
Radioactive pharmaceuticals used in the field of nuclear medicine as tracers in the diagnosis and treatment of many diseases radiopharmaceutical
Determines how the data are filtered in the reconstruction process. The appropriate ____ selection depends on which parts of the data should be enhanced or suppressed to optimize the image for diagnosis reconstruction algorithm
The distance between two R waves of a patient's ECG that represents one complete cardiac cycle R-R interval
An imaging technique used for CT-guided interventions. The process requires a scan acquisition, needle placement, another scan acquisition, adjustment of needle, another scan acquisition, & so forth until needle is confirmed to be in the correct location sequential CT
An index of glucose metabolism. The number represents the relative uptake of radionuclides in tissue standard uptake value
____ protocols use a helical mode to acquire images of the entire lung, rather than representative slices. Because these helical protocols cover the entire lung, they result in a more complete assessment of the lung volumetric HRCT

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