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Dataset for Beam Commissioning of the vero4drt System

International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2016年第1期5卷 70-77页

作者： Hideharu Miura Shuichi Ozawa Shintaro Tsuda Masahiro Hayata Kiyoshi Yamada Yasushi Nagata Hiroshima High-Precision Radiotherapy Cancer Center Hiroshima Japan Department of Radiation Oncology Institute of Biomedical & Health Science Hiroshima University Hiroshima Japan

We present the results of measurements made using the vero4drt radiation therapy system, which is not yet widely used, to assist technicians in achieving reliable and safe radiotherapy to the patient. We measured percent depth dose, beam profile, and relative scatter factor under water and air conditions. The vero4drt system has a 150 × 150-mm fixed secondary collimator. Its multileaf collimator (MLC) design is a single-focus type, with 30 pairs of 5 mm thick leaves at the isocenter, and produces a maximum field size of 150 × 150 mm. Profile measurements were performed using a 0.016-cm3 ionization chamber (PTW31016 pinpoint chamber;PTW, Freiburg GmbH Germany). A brass build-up cap was used for measurements obtained in air conditions. We present a useful measurement dataset for users of the vero4drt system.

关键词： vero4drt Beam Characteristic Commissioning

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Beam Characteristics at Low Dose Monitor Unit Settings for vero4drt

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2015年第4期4卷 284-289页

The stability of delivery of low monitor unit (MU) setting is important especially for step-and-shoot intensity-modulated radiotherapy (IMRT), because the nature of the technique is inherent to repeat beam on/off according to the number of the segments. This study evaluates the dose linearity and profile flatness/symmetry under low MU settings for vero4drt, a new linear-accelerator based irradiation system that currently implements step-and-shoot IMRT. To evaluate the dose linearity and flatness/symmetry, the point doses and beam profiles were measured as functions of MU and dose rates. The accuracy of dose delivery depended on the dose rate. Under all dose rates, the dose was linear within 1% above 5 MU and within 2% above 3 MU. The beam symmetry was degraded in-line compared with crossline, although both profiles were symmetric within 2% at all dose settings. The profile flatness was also within 2% above 5 MU at any dose rate and showed no significant variation among the low MU settings. To ensure stable beam delivery without increasing the treatment time of vero4drt, we recommend a delivery of 5 MU per segment at a dose rate of 500 MU/min.

关键词： vero4drt Step-and-Shoot IMRT Low Monitor Unit Beam Characteristic

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Investigation of Well-Balanced kV X-Ray Imaging Conditions between Skin Dose and Image Noise for Dynamic Tumor Tracking Irradiation

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2017年第4期6卷 410-420页

作者： Takahiro Nakai Akira Sawada Hiroaki Tanabe Masaki Sueoka Sho Taniuchi Kenji Takayama Takehiro Shiinoki Yoshitomo Ishihara Masaki Kokubo Department of Radiological Technology Kobe City Medical Center General Hospital Kobe Japan Faculty of Medical Science Kyoto College of Medical Science Nantan Japan Department of Radiological Technology Institute of Biomedical Research and Innovation Kobe Japan Department of Radiation Oncology and Image-Applied Therapy Kyoto University Kyoto Japan Department of Radiation Oncology Yamaguchi University Ube Japan Division of Radiation Oncology Institute of Biomedical Research and Innovation Kobe Japan Department of Radiation Oncology Kobe City Medical Center General Hospital Kobe Japan

Purpose: The purposes of this study were to estimate accumulated kV X-ray imaging dose throughout dynamic tumor tracking (DTT) irradiation by vero 4drt system and to address an analytical skin dose formula for well-balanced kV X-ray imaging conditions between skin dose and image noise. Method: First, skin dose was measured using kV X-ray tube, chamber, and water-equivalent phantoms. Next, imaging dose for six patients in DTT treatment was computed using log files. Subsequently, scattered dose ratio was calculated by amount of ionization in front of flat panel detector (FPD) for fields with size of maximum and the chamber for 0 - 200 mm-thickness phantoms and tube voltage of 60, 80, 100, 120 kV, respectively. Furthermore, image noise was computed from FPD images. Results: The skin dose was greater by a factor of 1.4 - 1.6 than those in Synergy XVI system. The image noise in FPD, ?was expressed as N = 0.045×(1/QFPDen)0.479, where QFPDen denotes amount of ionization in front of FPD. Then, skin dose, D (N, t, v) was formulated as (0.045/N)(1/0.479)/QFPDen/mAs (t, v) ×D/mAs (v), where QFPDen/mAs (t, v) and D/mAs (v) denote amount of ionization in front of FPD and skin dose per mAs, respectively. Using the formulae, it has been demonstrated that skin dose with 120 kV has become lower than any other tube voltage in this study. Conclusion: Using skin doses for the phantom, the skin dose throughout DTT irradiation was estimated as 0.50 Gy. Furthermore, skin dose by kV X-ray imaging was described as a function of image noise, phantom thickness, and tube voltage, suggesting image noise may be reduced with higher X-ray tube voltage in this phantom study.

关键词： Dynamic Tumor Tracking Irradiation Skin Dose vero4drt

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