Computerized Tomography Scan Parameters
Where must the body part of interest be placed for CT scans?
In the Isocenter.
Relationship of DFOV size and pixel, resolution and detail?
Large DFOV, Large Pixels, = Low Spatial Resolution, Low visibility of detail
What happens to kV as it is lowered and how it affects noise?
Lower kV=more noise
What does lower kV do to the resultant CT image?
More contrast
How is scan field of view determined?
Number of detectors activated
When body part is included in the region of interest but outside the scan field of view, causing it to not display any data?
Out of field artifact
Anatomical landmark for Abdominal CT?
Xiphoid Process
Alternative name for the display field of view?
Zoom or target
Anatomical landmark for Heat CT?
Glabella
What does Philips call scout imaging?
Surview
How is the tube positioned for Lat Scout?
90 degree angles to patient
Where is the tube suspended for AP scout?
Above patient
What is the alternative name for a scout image for CT scan?
CT Localizer radiograph
Alternative name for scan field of view?
Calibration field of view
Mode where the table stops at the scanning position and the tube rotates around the patient?
Conventional/Axial/Regular Mode
Alternative name for reconstruction algorithms?
Convolution kernels
Relationship of Display field of view with scan field of view?
DFOV can be equal or less to SFOV
Determines how much raw data is used in displaying the acquired image?
Display field of view
Length of the scan, measured in millimeters?
Range
Various filters applied in filtered back projection reconstruction?
Reconstruction algorithms
Diameter of the circular region within the scan plane over which projection data is collected?
Scan field of view
A set of user selectable factors that determine the resultant CT image, the scan length, orientation, image size, thickness and increment etc.
Scan parameters
What does Hitachi call scout imaging?
Scanogram
What does Toshiba call scout imaging?
Scanogram
What does GE call scout imaging?
Scout
Scanned projection radiograph acquired by the CT system to allow the user to prescribe the start and end locations of the scan range?
Scout image
For best resolution, what is the best scan field of view size?
Smallest possible.
Patient continuously moves in the z-axis direction while the tube rotates around?
Spiral/Helical
Anatomical landmark for chest and neck?
Sternal notch
What are the possible patient positions when positioning for CT?
Supine, Prone, Left or Right Lateral Decubitus
Anatomical landmark for Neck CT?
Thyroid Cartilage
What does Siemens call scout imaging?
Topogram
