Quantification of Artifacts and Image Distortions in 1.5 Tesla Magnetic Resonance Images of a Commercial Multi-Channel Vaginal Cylinder Brachytherapy Applicator Set | ||
| Journal of Biomedical Physics and Engineering | ||
| مقاله 4، دوره 13، شماره 6، اسفند 2023، صفحه 523-534 اصل مقاله (1.27 M) | ||
| نوع مقاله: Original Research | ||
| شناسه دیجیتال (DOI): 10.31661/jbpe.v0i0.2309-1665 | ||
| نویسندگان | ||
| Abolfazl Kanani1؛ Ali Fatemi-Ardakani2، 3، 4؛ Amir M. Owrangi5؛ Mehran Yazdi6؛ Hadi Baghbani7؛ Mohammad Amin Mosleh-Shirazi* 1، 8 | ||
| 1Ionizing and Non-Ionizing Radiation Protection Research Center (INIRPRC), School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran | ||
| 2Department of Physics, Jackson State University (JSU), Jackson, Mississippi, USA | ||
| 3SpinTecx, Jackson, Mississippi, USA | ||
| 4Department of Radiation Oncology, Community Health Systems (CHS) Cancer Network, Jackson, Mississippi, USA | ||
| 5Department of Radiation Oncology, UT Southwestern Medical Center, 2280 Inwood Rd, EC2.242, Dallas, TX 75235, USA | ||
| 6Signal and Image Processing Lab (SIPL), School of Electrical and Computer Eng, Shiraz University, Shiraz, Iran | ||
| 7Department of Radiology, Namazi Hospital, Shiraz University of Medical Sciences, Shiraz, Iran | ||
| 8Physics Unit, Department of Radio-Oncology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran | ||
| چکیده | ||
| Background: The BEBIG Portio multi-channel applicator provides better target dose coverage and sparing organs-at-risk compared to a single-channel cylinder. However, artifacts and distortions of Portio in magnetic resonance images (MRI) have not yet been reported. Objective: We aimed to quantify the artifacts and distortions in its 1.5-Tesla MR images before clinical use. Material and Methods: In this experimental study, we employed a gelatin-filled phantom to conduct our measurements. T2-weighted (T2W) images were examined for artifacts and distortions. Computed tomography (CT) images were used as a reference to assess image distortions. Artifact severity was measured by recording the full-width-at-half-maximum (FWHM) image pixel values at various positions along the length of the applicator/channels. CT and MRI-based applicator reconstruction accuracy were then compared, and signal-to-noise ratio (SNR) and contrast were also determined for the applicator images. Results: The applicator distortion level for the Portio applicator was less than the image spatial resolution (0.5±0.5 pixels). The average FWHM for the tandem applicator images was 5.23±0.39 mm, while it was 3.21±0.37 mm for all channels (compared to their actual diameters of 5.0 mm and 3.0 mm, respectively). The average applicator reconstruction difference between CT and MR images was 0.75±0.30 mm overall source dwell positions. The image SNR and contrast were both acceptable. Conclusion: These findings indicate that the Portio applicator has a satisfactory low level of artifacts and image distortions in 1.5-Tesla, T2W images. It may, therefore, be a promising option for MRI-guided multi-channel vaginal brachytherapy. | ||
تازه های تحقیق | ||
Abolfazl Kanani (Google Scholar) Mohammad Amin Mosleh-Shirazi (Google Scholar) | ||
| کلیدواژهها | ||
| Magnetic Resonance Imaging؛ Radiotherapy؛ Brachytherapy؛ Portio Applicator؛ Image Processing؛ Gynecolgical؛ Endometrial Cancer | ||
| مراجع | ||
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