Process - Projections

This command creates a projection file from a phantom. The options available when collecting projections are:

Geometry Sets the scanner geometry. The available geometries are:

Parallel
Equiangular
Equilinear

Number of detectors Sets the number of detectors in the detector array.

Number of views Sets the number of views to collect.

Samples per detector Sets the number of samples collected for each detector.

View Ratio Sets the field of view as a ratio of the diameter of the phantom. For normal scanning, use a value of 1.0.

Scan Ratio Sets the length of scanning as a ratio of the view diameter. For normal scanning, use a value of 1.0.

Focal length ratio Sets the distance between the radiation source and the center of the phantom as a ratio of the radius of the phantom. For parallel geometries, a value of 1.0 is optimal. For other geometries, this should be at least 2.0 to avoid artifacts.

Advanced Options

These options are visible only if Advanced Options has been selected in the File - Preferences dialog. These parameters default to optimal settings and don't need to be adjusted except by expert users.

Rotation Angle Sets the rotation amount as a fraction of a circle. For parallel geometries use a rotation angle of 0.5 and for equilinear and equiangular geometries use a rotation angle of 1. Using any other rotation angle will lead to artifacts.

Geometry	Sets the scanner geometry. The available geometries are: `Parallel` `Equiangular` `Equilinear`
Number of detectors	Sets the number of detectors in the detector array.
Number of views	Sets the number of views to collect.
Samples per detector	Sets the number of samples collected for each detector.
View Ratio	Sets the field of view as a ratio of the diameter of the phantom. For normal scanning, use a value of `1.0`.
Scan Ratio	Sets the length of scanning as a ratio of the view diameter. For normal scanning, use a value of `1.0`.
Focal length ratio	Sets the distance between the radiation source and the center of the phantom as a ratio of the radius of the phantom. For parallel geometries, a value of `1.0` is optimal. For other geometries, this should be at least `2.0` to avoid artifacts.