Optimization of multi-slice helical respiration-correlated CT: The effects of table speed and rotation time

Nicole M. Wink, Michael F. McNitt-Gray, Timothy D. Solberg

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

While respiration-correlated CT is gaining acceptance in clinical radiotherapy, the effect of scanning parameters on the image quality has yet to be addressed. The intent of this study was to characterize the effects of gantry rotation and table speed on various image quality characteristics in multi-slice, helical, retrospectively-gated CT images. Images of stationary and moving phantoms were obtained in helical mode on a 20-slice CT scanner. Motion was generated by a computer-controlled platform capable of moving simultaneously in two dimensions. Motion was monitored using a pressure gauge inserted inside an adjustable belt. Selected scans were retrospectively gated into ten phases based on the monitored motion. Gantry rotation speeds of 0.5 s and 1.0 s were evaluated with pitches ranging from 0.1 to 0.45. Several parameters, including calculated object volumes, trajectory (movement from peak to trough), deformation (actual volume divided by volume created with the maximum diameter of contoured object) and z-axis resolution, were used to characterize image quality. These studies indicate that for objects in the peak phase of a movement pattern that simulates breathing, retrospectively gated scans using fast gantry rotation speeds produce volume, trajectory, deformation and z-axis resolution results comparable with those of a stationary object.

Original languageEnglish (US)
Pages (from-to)5717-5729
Number of pages13
JournalPhysics in Medicine and Biology
Volume50
Issue number23
DOIs
StatePublished - Dec 7 2005

Fingerprint

respiration
Image quality
Respiration
gantry cranes
optimization
Trajectories
Pressure gages
Radiotherapy
trajectories
pressure gages
Scanning
Pressure
breathing
troughs
acceptability
scanners
radiation therapy
platforms
scanning

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physics and Astronomy (miscellaneous)
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Optimization of multi-slice helical respiration-correlated CT : The effects of table speed and rotation time. / Wink, Nicole M.; McNitt-Gray, Michael F.; Solberg, Timothy D.

In: Physics in Medicine and Biology, Vol. 50, No. 23, 07.12.2005, p. 5717-5729.

Research output: Contribution to journalArticle

Wink, Nicole M. ; McNitt-Gray, Michael F. ; Solberg, Timothy D. / Optimization of multi-slice helical respiration-correlated CT : The effects of table speed and rotation time. In: Physics in Medicine and Biology. 2005 ; Vol. 50, No. 23. pp. 5717-5729.
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