Question

Which statement is FALSE regarding 3D SSD?

1) helical image data is well suited for 3D SSD because there is minimal misregistration or gaps
2) the volume data, form which the 3D SSD is generated, is created by combing transverse, sagittal, and coronal recons.
3) the tissue surface may be selected by using a threshold vaule equal to the tissue's CT number
4) patient motion during the scan is detrimental to the quality of the 3D images

Answer 1

The false statement about 3D SSD is that volume data is created by combining transverse, sagittal, and coronal reconstructions. 3D SSD uses volumetric data often from helical scans to prevent misregistration and ensure continuous data.

Step-by-step explanation:

The statement that is FALSE regarding 3D SSD (Shaded Surface Display) about medical imaging is "the volume data, from which the 3D SSD is generated, is created by combining transverse, sagittal, and coronal recons." Generally, volume data for 3D reconstructions is not combined from different planar reconstructions but is instead acquired as a single volumetric dataset. In CT imaging, this can be achieved by moving the patient through the scanner to collect multiple consecutive slices or by using a helical/spiral scanning technique. The helical image data is particularly well-suited for 3D SSD because it minimizes the potential for misregistration or data gaps. Regarding selecting the tissue surface for rendering in 3D SSD, a threshold value related to the CT number of the tissue is indeed used. Lastly, patient motion during the scan is detrimental because it can severely degrade the quality of the 3D images, producing artifacts and reducing clarity.