Modalities and techniques used for stereotactic radiotherapy, intensity-modulated radiotherapy, and image-guided radiotherapy: A 2018 survey by the Japan Society of Medical Physics

Akino, Yuichi; Tohyama, Naoki; Akita, Kazuhiko; Ishikawa, Masayori; Kawamorita, Ryu; Kurooka, Masahiko; Sumida, Iori; Nakaguchi, Yuji; Miyaura, Kazunori; Nakamura, Mitsuhiro

doi:10.1016/j.ejmp.2019.07.009

Cited by 13 publications

(10 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Advanced techniques, such as intensity-modulated radiation therapy and volumetric-modulated arc therapy (VMAT), are effective in reducing the dose to the OARs while maintaining dose coverage to the tumor. Recently, VMAT is increasingly being used in clinical practice due to its ability to rapidly deliver beams [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…To address this problem, respiration motion management techniques, such as abdominal compression, breath-hold (BH), respiratory gating and real-time tumor tracking, have been used during the course of treatment [ 3 ]. Of these techniques, BH is one of the most commonly used owing to its versatility [ 2 ]. Some researchers reported that BH was clinically useful in cases with disease sites, such as the lung, breast, liver and pancreas [ 6–11 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Positional repeatability and variation in internal and external markers during volumetric-modulated arc therapy under end-exhalation breath-hold conditions for pancreatic cancer patients

Sasaki

Nakamura

Ono

et al. 2020

Journal of Radiation Research

Self Cite

View full text Add to dashboard Cite

The purpose of this study was to assess the positional repeatability of internal and external markers among multiple breath-hold (BH) sessions and evaluate the positional variation of these markers within BH sessions for volumetric-modulated arc therapy (VMAT) for pancreatic cancer patients. A total of 13 consecutive pancreatic cancer patients with an internal marker were enrolled. Single full-arc coplanar VMAT was delivered under end-exhalation BH conditions while monitoring the internal marker with kilovoltage (kV) X-ray fluoroscopy. Positional repeatability of the internal and external markers was determined by the difference between the reference and zero position in all BH sessions, and positional variation was defined by the displacement from the reference position in each BH session during megavolt beam delivery. The overall positional repeatability was 0.6 ± 1.5 mm in the X-axis for the centroid of the internal marker (CoIM), −0.1 ± 2.2 mm in the Y-axis for the CoIM, and 0.8 ± 2.2 mm for the external marker. The frequency of an internal marker position appearing > 2 mm from the reference position in the Y-axis, despite the external marker position being ≤2 mm from the reference position, ranged from 0.0 to 39.9% for each patient. Meanwhile, the proportion of sessions with positional variation ≤2 mm was 93.2 and 98.7% for the CoIM and external marker, respectively. External marker motion can be used as a surrogate for pancreatic tumor motion during BH-VMAT delivery; however, margins of ~5 mm were required to ensure positional repeatability.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Positional repeatability and variation in internal and external markers during volumetric-modulated arc therapy under end-exhalation breath-hold conditions for pancreatic cancer patients

Sasaki

Nakamura

Ono

et al. 2020

Journal of Radiation Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…To the best of our knowledge, very little literature has been published regarding FFF beam utilization surveys in Japan or other countries. To understand the current state of FFF beam adoption, the quality assurance (QA)/quality control (QC) 2018–2019 Committee of the Japan Society of Medical Physics (JSMP) conducted a follow-up survey to previous surveys conducted on the state of radiotherapy in Japan [ 11 , 12 ]. Modern LINACs in which the flattening filters have been removed since the beginning of development (e.g.…”

Section: Introductionmentioning

confidence: 99%

Survey on utilization of flattening filter-free photon beams in Japan

Kodama

Yasui

Nishioka³

et al. 2021

Journal of Radiation Research

Self Cite

View full text Add to dashboard Cite

To understand the current state of flattening filter-free (FFF) beam implementation in C-arm linear accelerators (LINAC) in Japan, the quality assurance (QA)/quality control (QC) 2018–2019 Committee of the Japan Society of Medical Physics (JSMP) conducted a 37-question survey, designed to investigate facility information and specifications regarding FFF beam adoption and usage. The survey comprised six sections: facility information, devices, clinical usage, standard calibration protocols, modeling for treatment planning (TPS) systems and commissioning and QA/QC. A web-based questionnaire was developed. Responses were collected between 18 June and 18 September 2019. Of the 846 institutions implementing external radiotherapy, 323 replied. Of these institutions, 92 had adopted FFF beams and 66 had treated patients using them. FFF beams were used in stereotactic radiation therapy (SRT) for almost all disease sites, especially for the lungs using 6 MV and liver using 10 MV in 51 and 32 institutions, respectively. The number of institutions using FFF beams for treatment increased yearly, from eight before 2015 to 60 in 2018. Farmer-type ionization chambers were used as the standard calibration protocol in 66 (72%) institutions. In 73 (80%) institutions, the beam-quality conversion factor for FFF beams was calculated from TPR20,10, via the same protocol used for beams with flattening filter (WFF). Commissioning, periodic QA and patient-specific QA for FFF beams also followed the procedures used for WFF beams. FFF beams were primarily used in high-volume centers for SRT. In most institutions, measurement and QA was conducted via the procedures used for WFF beams.

show abstract

“…[1][2][3] The stereotaxic frame has been proposed as an invasive head ring for precise fixation of the target lesion, 4 and it has also been IGRT plays an essential role in brain SRS because it supports identification of accurate targets and avoidance of organs at risk. 7 The methods of IGRT for brain SRS identified in the web survey are reported to be used in the following order: kV or MV cone beam computed tomography (CBCT), two-dimensional (2D) imaging, and ExacTrac X-ray system (ETX) (Brainlab AG, Munich, Germany).…”

Section: Introductionmentioning

confidence: 99%

Differences in image density adjustment parameters on the image matching accuracy of a floor‐mounted kV X‐ray image‐guided radiation therapy system

Sakuragawa

Sasaki

Kamomae

et al. 2021

J Applied Clin Med Phys

View full text Add to dashboard Cite

This study aimed to investigate the effect of two different image density adjustment parameters on the results of image matching at six degrees of freedom using radiographic images generated by the ExacTrac X-ray system in brain stereotactic radiosurgery (SRS). This study comprised 32 patients who underwent brain SRS at our hospital from January 2020 to December 2020. In this study, (1) the default parameter (an image density parameter between "tissue" and "bone") was an image density parameter for digitally reconstructed radiograph (DRR) generation used at many facilities, and (2) the bone parameter was the steepest contrast parameter used at our hospital. Of the 32 patients, 24 (75%) had a couch angle of 0.5 mm or more in the translational direction or 0.5 • or more in the rotational direction, and 10 (31%) had a couch angle of 1.0 mm or more in the translational direction or 1.0 • or more in the rotational direction. Among the 131 cases of all couch angles, 46 (35%) cases had a translational direction of 0.5 mm or more or a rotational direction of 0.5 • or more, and 15 (11%) had a translational direction of 1.0 mm or more or a rotational direction of 1.0 • or more. The results of this study indicate the usefulness of using appropriate DRR parameters for each case, rather than using the default settings. The use of appropriate DRR parameters can lead to accurate position matching results, leading to fewer image-guided radiation therapy shots and a lower imaging dose.

show abstract

Modalities and techniques used for stereotactic radiotherapy, intensity-modulated radiotherapy, and image-guided radiotherapy: A 2018 survey by the Japan Society of Medical Physics

Cited by 13 publications

References 38 publications

Positional repeatability and variation in internal and external markers during volumetric-modulated arc therapy under end-exhalation breath-hold conditions for pancreatic cancer patients

Positional repeatability and variation in internal and external markers during volumetric-modulated arc therapy under end-exhalation breath-hold conditions for pancreatic cancer patients

Survey on utilization of flattening filter-free photon beams in Japan

Differences in image density adjustment parameters on the image matching accuracy of a floor‐mounted kV X‐ray image‐guided radiation therapy system

Contact Info

Product

Resources

About