Computerized Tomography Scan Parameters

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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


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