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Computed Tomography01:10

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm
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A server-based solution for misregistration correction in PET/CT using limited-coverage and data-driven gated CT.

Tinsu Pan1, Dershan Luo2

  • 1Department of Imaging Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.

Medical Physics
|March 8, 2026
PubMed
Summary
This summary is machine-generated.

A new misregistration correction server (MCS) reduces CT dose and PET scan time by correcting image misregistration without repeat scans. This solution improves lesion localization and quantification accuracy in PET/CT imaging.

Keywords:
attenuation correctiondata‐driven gatingmisregistration correctionpositron emission tomographyrespiratory motion

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Area of Science:

  • Medical Imaging
  • Radiology
  • Nuclear Medicine

Background:

  • Image misregistration in CT and PET scans impacts lesion localization and tracer uptake quantification.
  • Current solutions involve repeat scans, increasing CT dose and PET acquisition time.
  • A need exists for efficient dose reduction without additional PET scans.

Purpose of the Study:

  • To develop a misregistration correction server (MCS) to address excessive CT dose and unnecessary PET scans.
  • To solve issues with current limited-coverage (LC) CT and LC PET/CT procedures.

Main Methods:

  • Developed an MCS to embed limited-coverage (LC) CT or data-driven gated (DDG) CT into PET/CT for attenuation correction.
  • MCS supports 9 scanners (8 GE DMI, 1 Siemens Quadra) and processes data simultaneously.
  • Over 2,033 patient studies have been corrected using the MCS.

Main Results:

  • MCS processing time is ~1 min (LC CT) and ~3 min (DDG CT).
  • LC/DDG CT dose length product (DLP) was significantly lower (23.5% GE, 16.8% Siemens) than whole-body (WB) CT.
  • Registration improved in most corrected studies, minimizing operational impact and eliminating repeat PET scans.

Conclusions:

  • A novel MCS effectively corrects PET/CT misregistration for GE and Siemens scanners.
  • The MCS reduces CT dose and PET scan time by enabling repeat CT or DDG CT without repeat PET.
  • The MCS offers a significant reduction in patient radiation dose compared to traditional methods.