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Uchinami Y, Miyamoto N, Abo D, Morita R, Ogawa K, Kakisaka T, Suzuki R, Miyazaki T, Taguchi H, Katoh N, Aoyama H. Real-time tumor-tracking radiotherapy with SyncTraX for primary liver tumors requiring isocenter shift†. JOURNAL OF RADIATION RESEARCH 2024; 65:92-99. [PMID: 37996094 PMCID: PMC10803168 DOI: 10.1093/jrr/rrad088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 10/06/2023] [Indexed: 11/25/2023]
Abstract
The SyncTraX series enables real-time tumor-tracking radiotherapy through the real-time recognition of a fiducial marker using fluoroscopic images. In this system, the isocenter should be located within approximately 5-7.5 cm from the marker, depending on the version, owing to the limited field of view. If the marker is placed away from the tumor, the isocenter should be shifted toward the marker. This study aimed to investigate stereotactic body radiotherapy (SBRT) outcomes of primary liver tumors treated with SyncTraX in cases where the isocenter was shifted marginally or outside the planning target volume (PTV). Twelve patients with 13 liver tumors were included in the analysis. Their isocenter was shifted toward the marker and was placed marginally or outside the PTV. The prescribed doses were generally 40 Gy in four fractions or 48 Gy in eight fractions. The overall survival (OS) and local control (LC) rates were calculated using the Kaplan-Meier method. All patients completed the scheduled SBRT. The median distance between the fiducial marker and PTV centroid was 56.0 (interquartile range [IQR]: 52.7-66.7) mm. By shifting the isocenter toward the marker, the median distance between the marker and isocenter decreased to 34.0 (IQR: 33.4-39.7) mm. With a median follow-up period of 25.3 (range: 6.9-70.0) months, the 2-year OS and LC rates were 100.0% (95% confidence interval: 100-100). An isocenter shift makes SBRT with SyncTraX feasible in cases where the fiducial marker is distant from the tumor.
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Affiliation(s)
- Yusuke Uchinami
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, North 15 West 7, Kita-ku, Sapporo 060-8638, Japan
| | - Naoki Miyamoto
- Department of Medical Physics, Hokkaido University Hospital, North 14 West 5, Kita-ku, Sapporo 060-8648, Japan
- Division of Applied Quantum Science and Engineering, Hokkaido University Faculty of Engineering, North 13 West 8, Kita-ku, Sapporo 060-8628, Japan
| | - Daisuke Abo
- Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, North 14 West 5, Kita-ku, Sapporo 060-8648, Japan
| | - Ryo Morita
- Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, North 14 West 5, Kita-ku, Sapporo 060-8648, Japan
| | - Koji Ogawa
- Department of Gastroenterology and Hepatology, Hokkaido University Faculty of Medicine, North 15 West 7, Kita-ku, Sapporo 060-8638, Japan
| | - Tatsuhiko Kakisaka
- Department of Gastroenterological Surgery, Hokkaido University Faculty of Medicine, North 15 West 7, Kita-ku, Sapporo, Hokkaido 060-8638, Japan
| | - Ryusuke Suzuki
- Department of Medical Physics, Hokkaido University Hospital, North 14 West 5, Kita-ku, Sapporo 060-8648, Japan
| | - Tomohiko Miyazaki
- Department of Radiation Oncology, Hokkaido University Hospital, North 14 West 5, Kita-ku, Sapporo 060-8648, Japan
| | - Hiroshi Taguchi
- Department of Radiation Oncology, Hokkaido University Hospital, North 14 West 5, Kita-ku, Sapporo 060-8648, Japan
| | - Norio Katoh
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, North 15 West 7, Kita-ku, Sapporo 060-8638, Japan
| | - Hidefumi Aoyama
- Department of Radiation Oncology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, North 15 West 7, Kita-ku, Sapporo 060-8638, Japan
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Feng Z, Li S, Gu T, Zhou X, Zhang Z, Yang Z, Hou J, Zhu J, Zhang D. Electrolyte Analysis in Blood Serum by Laser-Induced Breakdown Spectroscopy Using a Portable Laser. Molecules 2022; 27:molecules27196438. [PMID: 36234975 PMCID: PMC9573104 DOI: 10.3390/molecules27196438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 08/20/2022] [Accepted: 08/26/2022] [Indexed: 11/16/2022] Open
Abstract
The fast and reliable analysis of electrolytes such as K, Na, Ca in human blood serum has become an indispensable tool for diagnosing and preventing diseases. Laser-induced breakdown spectroscopy (LIBS) has been demonstrated as a powerful analytical technique on elements. To apply LIBS to the quantitative analysis of electrolyte elements in real time, a self-developed portable laser was used to measure blood serum samples supported by glass slides and filter paper in this work. The partial least squares regression (PLSR) method was employed for predicting the concentrations of K, Na, Ca from serum LIBS spectra. Great prediction accuracies with excellent linearity were obtained for the serum samples, both on glass slides and filter paper. For blood serum on glass slides, the prediction accuracies for K, Na, Ca were 1.45%, 0.61% and 3.80%. Moreover, for blood serum on filter paper, the corresponding prediction accuracies were 7.47%, 1.56% and 0.52%. The results show that LIBS using a portable laser with the assistance of PLSR can be used for accurate quantitative analysis of elements in blood serum in real time. This work reveals that the handheld LIBS instruments will be an excellent tool for real-time clinical practice.
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Affiliation(s)
- Zhongqi Feng
- School of Optoelectronic Engineering, Xidian University, Xi’an 710071, China
| | - Shuaishuai Li
- School of Optoelectronic Engineering, Xidian University, Xi’an 710071, China
| | - Tianyu Gu
- School of Optoelectronic Engineering, Xidian University, Xi’an 710071, China
| | - Xiaofei Zhou
- Clinical Laboratory, The Hospital of Xidian University, Xi’an 710071, China
| | - Zixu Zhang
- School of Optoelectronic Engineering, Xidian University, Xi’an 710071, China
| | - Zhifu Yang
- Department of Pharmacy, Xijing Hospital, Xi’an 710032, China
- Correspondence: (Z.Y.); (D.Z.)
| | - Jiajia Hou
- School of Optoelectronic Engineering, Xidian University, Xi’an 710071, China
| | - Jiangfeng Zhu
- School of Optoelectronic Engineering, Xidian University, Xi’an 710071, China
| | - Dacheng Zhang
- School of Optoelectronic Engineering, Xidian University, Xi’an 710071, China
- Correspondence: (Z.Y.); (D.Z.)
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