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Four-dimensional magnetic resonance imaging for the determination of tumour movement and its evaluation using a dynamic porcine lung phantom.
- Source :
-
Physics in medicine and biology [Phys Med Biol] 2007 Sep 21; Vol. 52 (18), pp. N401-15. Date of Electronic Publication: 2007 Sep 04. - Publication Year :
- 2007
-
Abstract
- A method of four-dimensional (4D) magnetic resonance imaging (MRI) has been implemented and evaluated. It consists of retrospective sorting and slice stacking of two-dimensional (2D) images using an external signal for motion monitoring of the object to be imaged. The presented method aims to determine the tumour trajectories based on a signal that is appropriate for monitoring the movement of the target volume during radiotherapy such that the radiation delivery can be adapted to the movement. For evaluation of the 4D-MRI method, it has been applied to a dynamic lung phantom, which exhibits periodic respiratory movement of a porcine heart-lung explant with artificial pulmonary nodules. Anatomic changes of the lung phantom caused by respiratory motion have been quantified, revealing hysteresis. The results demonstrate the feasibility of the presented method of 4D-MRI. In particular, it enables the determination of trajectories of periodically moving objects with an uncertainty in the order of 1 mm.
- Subjects :
- Algorithms
Animals
Image Interpretation, Computer-Assisted methods
In Vitro Techniques
Pattern Recognition, Automated methods
Reproducibility of Results
Sensitivity and Specificity
Swine
Artifacts
Image Enhancement methods
Imaging, Three-Dimensional methods
Lung pathology
Lung Neoplasms diagnosis
Magnetic Resonance Imaging methods
Movement
Subjects
Details
- Language :
- English
- ISSN :
- 0031-9155
- Volume :
- 52
- Issue :
- 18
- Database :
- MEDLINE
- Journal :
- Physics in medicine and biology
- Publication Type :
- Academic Journal
- Accession number :
- 17804874
- Full Text :
- https://doi.org/10.1088/0031-9155/52/18/N02