| Assessment of geometrical accuracy of magnetic resonance images for radiation therapy of lung cancers. | |
| | |
MedLine Citation:
|
PMID: 14604425 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The purpose of this research was to investigate the geometrical accuracy of magnetic resonance (MR) images used in the radiation therapy treatment planning for lung cancer. In this study, the capability of MR imaging to acquire dynamic two-dimensional images was explored to access the motion of lung tumors. Due to a number of factors, including the use of a large field-of-view for the thorax, MR images are particularly subject to geometrical distortions caused by the inhomogeneity and gradient nonlinearity of the magnetic field. To quantify such distortions, we constructed a phantom, which approximated the dimensions of the upper thorax and included two air cavities. Evenly spaced vials containing contrast agent could be held in three directions with their cross-sections in the coronal, sagittal, and axial planes, respectively, within the air cavities. MR images of the phantom were acquired using fast spin echo (FSE) and fast gradient echo (fGRE) sequences. The positions of the vials according to their centers of mass were measured from the MR images and registered to the corresponding computed tomography images for comparison. Results showed the fGRE sequence exhibited no errors >2.0 mm in the sagittal and coronal planes, whereas the FSE sequence produced images with errors between 2.0 and 4.0 mm along the phantom's perimeter in the axial plane. On the basis of these results, the fGRE sequence was considered to be clinically acceptable in acquiring images in all sagittal and coronal planes tested. However, the spatial accuracy in periphery of the axial FSE images exceeded the acceptable criteria for the acquisition parameters used in this study. |
| | |
Authors:
|
N Koch; H H Liu; L E Olsson; E F Jackson |
Related Documents
:
|
1414805 - Mr imaging of the lungs: value of short te spin-echo pulse sequences. 21150065 - Posttraumatic retroclival acute subdural hematoma: report of two cases and review of li... 8073315 - Metallic spinal artifacts in magnetic resonance imaging. 8271905 - Mri measurements of the dependence on t1 of the echo amplitudes using a multiple spin-e... 14616305 - Diffusion-weighted mr findings in isolated angiitis of the central nervous system (iacns). 12815135 - Staging of non-small-cell lung cancer with integrated positron-emission tomography and ... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Journal of applied clinical medical physics / American College of Medical Physics Volume: 4 ISSN: 1526-9914 ISO Abbreviation: J Appl Clin Med Phys Publication Date: 2003 |
Date Detail:
|
Created Date: 2003-11-07 Completed Date: 2004-01-20 Revised Date: 2004-11-17 |
Medline Journal Info:
|
Nlm Unique ID: 101089176 Medline TA: J Appl Clin Med Phys Country: United States |
Other Details:
|
Languages: eng Pagination: 352-64 Citation Subset: IM |
Copyright Information:
|
(c) 2003 American College of Medical Physics. |
Affiliation:
|
Department of Radiation Physics, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston 77030, USA. nckoch@mdanderson.org |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Computer Simulation Humans Image Interpretation, Computer-Assisted / methods, standards Lung Neoplasms / pathology, radiotherapy* Magnetic Resonance Imaging / standards* Models, Theoretical Phantoms, Imaging / standards Quality Assurance, Health Care / methods Radiotherapy Planning, Computer-Assisted / methods, standards Radiotherapy, Computer-Assisted / methods, standards |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Dose calculation accuracy of lung planning with a commercial IMRT treatment planning system.
Next Document: CT slice index and thickness: impact on organ contouring in radiation treatment planning for prostat...