Image Production
CT numbers are referenced in this way
What are Hounsfield numbers?
Low concentration of oxygen in the blood.
What is hypoxia?
This device houses the X-ray tube and the data aquisition system (DAS).
What is the Gantry?
Imaging through the dense bones of the skull can produce this type of artifact
What is beam hardening?
A routine scan which begins at sternal notch and ends at the adrenal glands.
What is a Chest CT?
Grainy appearance on a CT image.
What is noise?
Term used to describe difficulty breathing?
What is dyspnea?
Most common type of noise on a CT scan.
What is quantum noise?
The range of CT numbers in a CT window.
What is window width?
Protocol to visualize chest parenchyma for COPD or fibrosis?
What is high resolution CT (HRCT)?
This selection controls the contrast and brightness of an image.
What is the window or windowing?
The technical factor that has a direct effect on patient radiation dose?
What is mAs? (milliamperes per second)
scan geometry for 3rd generation scanners.
What is rotate-rotate?
Artifact that demonstrates a faulty detector
What is a ring artifact?
IV contrast flow after it leaves the superior vena cava (SVC)?
What is right atrium?
A set of rules to solve a mathematical problem.
What is an algorithm?
Renal function decline after administration of IV contrast.
What is contrast induced nephrotoxicity?
Reconstruction with some change in technical factors.
What is retropective reconstruction?
Ability of a scanner to produce the same CT number regardless of location in a homogenous object.
What is uniformity?
What study would patient be instructed to not swallow to reduce motion blurring?
What is CT scan of neck?
Applying a mathematical filter to an image to remove blurring after reconstruction.
What is convolution?
Portion of cardiac cycle on an EKG that correspons to cardiac diastole.
What is the T wave?
CT number of zero corresponds with this substance.
What is water?
The axis that determines slice thickness on a CT image.
What is the z-axis?
Imaging for venous thrombosis.
What is CT Venography?