1
|
Yasue K, Fuse H, Asano Y, Kato M, Shinoda K, Ikoma H, Fujisaki T, Tamaki Y. Investigation of fiducial marker recognition possibility by water equivalent length in real-time tracking radiotherapy. Jpn J Radiol 2021; 40:318-325. [PMID: 34655387 DOI: 10.1007/s11604-021-01207-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 09/30/2021] [Indexed: 12/28/2022]
Abstract
Real-time tumor tracking radiotherapy (RTRT) systems typically use fiducial markers implanted near the tumor to track the target using X-ray fluoroscopy. Template pattern matching, used in tracking, is often used to automatically localize the fiducial markers. In radiotherapy of the liver, the thickness of the body that can recognize the fiducial markers must be clinically assessed. The purpose of this study was to quantify the recognition of fiducial markers according to body thickness in stereotactic body radiotherapy of the liver using clinical images obtained using SyncTraX FX4. The recognition scores of fiducial markers were examined in relation to water equivalent length (WEL), tube current, and each flat panel detector. The relationship between the contrast ratio of the fiducial marker and the background and the WEL was also investigated. The average recognition score was found to be less than 20 when the WEL was greater than 25 cm. The probability of successful tracking of image recognition was mostly smaller than 0.8 when the WEL was over 30 cm. The relationship between WEL and tube current did not significantly differ between 100 and 140 mA, but there was a significant difference (p < 0.05) for all other combinations. To ensure tracking of fiducial markers during SBRT, if the WEL representing body thickness is longer than 25 cm, the X-ray fluoroscopy arrangement should be determined based on the WEL.
Collapse
Affiliation(s)
- Kenji Yasue
- Graduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2, Ami, Inashiki, Ibaraki, 300-0394, Japan.,Department of Radiation Technology, Ibaraki Prefectural Central Hospital, 6528, Koibuchi, Kasama, Ibaraki, 309-1793, Japan
| | - Hiraku Fuse
- Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2, Ami, Inashiki, Ibaraki, 300-0394, Japan.
| | - Yuto Asano
- Department of Radiation Technology, Ibaraki Prefectural Central Hospital, 6528, Koibuchi, Kasama, Ibaraki, 309-1793, Japan
| | - Miho Kato
- Department of Radiation Technology, Ibaraki Prefectural Central Hospital, 6528, Koibuchi, Kasama, Ibaraki, 309-1793, Japan
| | - Kazuya Shinoda
- Department of Radiation Technology, Ibaraki Prefectural Central Hospital, 6528, Koibuchi, Kasama, Ibaraki, 309-1793, Japan
| | - Hideaki Ikoma
- Department of Radiation Technology, Ibaraki Prefectural Central Hospital, 6528, Koibuchi, Kasama, Ibaraki, 309-1793, Japan
| | - Tatsuya Fujisaki
- Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2, Ami, Inashiki, Ibaraki, 300-0394, Japan
| | - Yoshio Tamaki
- Department of Radiation Oncology, Ibaraki Prefectural Central Hospital, 6528, Koibuchi, Kasama, Ibaraki, 309-1793, Japan
| |
Collapse
|