Multi-Slice CT - Computed Tomography - Lecture Slides, Slides of Computed Tomography

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Multi-Slice CT

Third Generation CT

Single or Multislice

Patient

Z-axis orientation perpendicular to page

Single-Slice Detectors

 Many detectors rotate around

patient

 Single row in z-direction

 Slice thickness determined by

collimation

Z-Axis docsity.com

Single Slice CT: Slice Thickness

Z-Axis

Collimated Beam Thickness

Z-Axis

Collimated Beam Thickness

Thin slice

Thick slice

What’s Different for Multislice CT?

Multislice CT

 Multiple rows of

detectors

 Open collimators

in “Z” direction

http://www.veterinary- imaging.com/images/MSS_CT.gif

Single Slice vs. Multislice Detector

Z-Axis

Collimated Beam Thickness (^) Single slice detector

Multislice detector

Multi-Slice Detectors

 Many detectors going around patient

 Many detector rows in z-direction

 Slice thickness determined by

 Collimation  electronic detector selection

“Z” Direction Single Multi

Distribution of detectors in axial direction

varies with manufacturer

All detectors

same width

“Z”

Direction

Variable widths

Multi-slice CT

Uniform Detector Thickness

 Multiple detectors in axial

direction

 Size must accommodate thinnest slice

 Detector signals can be used

 Individually  In groups

Four thin slices

Four thicker slices

“z” direction

Detectors vs. Channels Example

 16 detectors

 4 channels

Multi-Slice Detector Example

16 Detector Rows, 4 Channels

Detectors vs. Channels

4 X 2.5 mm

 Beam collimated to 8

detector rows

 2 detector rows per DAS

channel

Effective Detector

Detectors vs. Channels

4 X 3.75 mm

 Beam collimated to 12

detector rows

 3 detector rows per DAS

channel

Effective Detector