Reduction of MRI signal distortion from titanium intracavitary brachytherapy applicator by optimizing pulse sequence parameters Journal Article


Authors: Sullivan, T. P.; Harkenrider, M. M.; Surucu, M; Wood, A. M.; Yacoub, J. H.; Shea, S. M.
Article Title: Reduction of MRI signal distortion from titanium intracavitary brachytherapy applicator by optimizing pulse sequence parameters
Abstract: PURPOSE: To demonstrate that optimized pulse sequence parameters for a T2-weighted (T2w) fast spin echo acquisition reduced artifacts from a titanium brachytherapy applicator compared to conventional sequence parameters. METHODS AND MATERIALS: Following Institutional Review Board approval and informed consent, seven patients were successfully imaged with both standard sagittal T2w fast spin echo parameters (voxel size of 0.98 x 0.78 x 4.0 mm(3); readout bandwidth of 200 Hz/px; repetition time of 2800 ms; echo time of 91 ms; echo train length of 15; 36 slices; and imaging time of 3:16 min) and an additional optimized T2w sequence (voxel size of 0.98 x 0.98 x 4.0 mm(3); readout bandwidth of 500 Hz/px; repetition time of 3610 ms; echo time of 91 ms; echo train length of 25; 18-36 slices; and imaging time of 1:15-2:30 min), which had demonstrated artifact reduction in prior phantom work. Visualized intracavitary tandem was hand-segmented by two of the authors. Three body imaging radiologists assessed image quality and intraobserver agreement scores were analyzed. RESULTS: The average segmented volume of the intracavitary applicator significantly (p lt; 0.05) decreased with the experimental pulse sequence parameters as compared to the standard pulse sequence. Comparison of experimental and standard T2w sequence qualitative scores for each reviewer showed no significant differences between the two techniques. CONCLUSIONS: This study demonstrated that pulse sequence parameter optimization can significantly reduce distortion artifact from titanium applicators while maintaining image quality and reasonable imaging times.
Keywords: Radiation Oncology; brachytherapy; Artifacts; Cervical cancer; MRI; Distortions
Journal Title: Brachytherapy
Volume: 17
Issue: 2
ISSN: 1873-1449; 1538-4721
Publisher: Elsevier Inc  
Journal Place: United States
Date Published: 2018
Start Page: 377
End Page: 382
Language: eng
DOI/URL:
Notes: LR: 20180302; CI: Copyright (c) 2017; JID: 101137600; OTO: NOTNLM; 2017/03/24 00:00 [received]; 2017/09/23 00:00 [revised]; 2017/10/23 00:00 [accepted]; 2017/11/28 06:00 [pubmed]; 2017/11/28 06:00 [medline]; 2017/11/28 06:00 [entrez]; ppublish