Varian halcyon dose rate Core Radiosurgery Features • erfectPitch™P 6 degrees of freedom couch — Supports robotic couch alignment with smooth isocentric rotation in 6 degrees . Nov 21, 2022 · The Halcyon consists of a ring-based linear accelerator with a 6 MV FFF photon beam, with a maximum dose rate of 800 monitor units (MUs) per minute and a maximum field size of 28 × 28 cm per isocenter. Oct 29, 2019 · Purpose: Varian Halcyon linear accelerator version 2 (The Halcyon 2. Shown are the target volume contours of the CTVP‐SV (blue), the high dose PTVBoost (pink) and low dose PTV (red) in (a) the planning CT and (b) the planning MRI T2 sequence. Each case used volumetric modulated arc therapy (VMAT) 16 with 1 to 2 axial half arcs and 2 to 4 noncoplanar half arcs using 6 flattening filter free beam with a dose rate of 1400 monitor units per minute. 1367 Helsinki, Finland Tel: 91. 5 RPM), and four times faster gantry speed (4 RPM). The segment number of each IMRT field was 165. Sep 1, 2018 · The Varian Halcyon linear accelerator is designed for faster treatment time and fewer treatment errors than conventional linear accelerators. 34%, respectively. The leaf has an 8. Aug 5, 2021 · Target volume contours. 3 (6 MV) and 5. Control chart for EDR2 Film PSQA. 1 Radiation unit Varian’s ring-shaped Halcyon linac (Varian Medical Systems, Palo Alto, CA, version 2. The Varian Halcyon linear accelerator is designed for faster treatment time and fewer treatment errors than conventional linear accelerators. named Halcyon (Varian Medical Systems, Palo Alto CA). Methods On CT images of 10 patients with bilateral breast cancer, four Halcyon plans with different setup fields were generated, and dosimetric comparisons using Bonferroni’s email: info. devices, the Halcyon system introduces a worldwide consistency across clinics. Tel: 770. Feb 25, 2022 · The Halcyon 2. Aug 5, 2021 · Hypofractionated high-dose prostate cancer SIB VMAT on the Halcyon system is feasible with comparable plan quality in reference to a standard C-arm Elekta Synergy linac. Please consult your Varian representative for more information. 0) version, and the dose calculation algorithm was anisotropic analytical algorithm (AAA) in Halcyon(2. In contrast to conventional breast cancer treatment using FF beams, Halcyon can be exclusively utilized with FFF beams for treatment. Dose Rate: A particular “triode” electron gun is inside the beamforming system. VMAT planning with Halcyon™ linac was conducted using a whole-body computed tomography data set. Halcyon’s treatments are true image guided ra- Mar 11, 2021 · All measurements were performed on a Varian Halcyon linear accelerator using the single 6 MV FFF beam (TPR 20,10 = 0. The planning target volume (PTV) included the body cropped 3 mm from the source. The Halcyon 2. Dose Rate Corrected Readings; Dose Rate Reading Deviations; Dose Rate Ion recombination correction factors, P ion, are larger for FFF beams compared to flattened beams2 in part due to the increase in dose rate, however, the Halcyon™'s 800 MU/min dose rate is closer to the 600 MU/min dose rate offered by Varian's flattened fields, than to the 1400 MU/min or greater dose rate offered in TrueBeam ® 's FFF modes Dec 1, 2018 · Halcyon system has one unique energy of 6XFFF and a maximum dose rate of 800 UM/min. Raouf’s team also created a treatment plan for delivery on a Clinac® system and compared the two. 2 min higher than Truebeam due to the maximum achievable dose-rate of 800MU/min on Halcyon compared to 1400MU/min on SBRT-dedicated Truebeam Linac for a 6MV-FFF beam. China Co. 5700 800. This difference leads to an increase of BOT in Halcyon VMAT plans, although overall treatment time would be similar as described above. Radiation Testing Beam performance tests: • Backup monitor constancy • Dose rate output constancy • Beam profile constancy • Energy check • MU linearity The maximum velocity of the leaves is 5. We would like to show you a description here but the site won’t allow us. Dec 14, 2021 · This study aimed to evaluate whether VMAT with Halcyon™ linac can be clinically used for TBI. Apr 8, 2025 · Use our Varian Linear Accelerator Comparison Chart to find the best LINAC for your facility, including Edge, TrueBeam, Trilogy, and Clinac. 7 (Varian Medical Systems) was used for the clinically delivered plans in all cases. Ten-year survival after High-Dose-Rate Brachytherapy combined with External Beam Radiation Therapy in high-risk prostate cancer: A comparison with the Norwegian SPCG-7 cohort. Other dosimetric parameters. 5. 5637 varian. 98 mm −1. A dose of 12 Gy in six fractions was prescribed for 50% of the PTV. This beam is used for both treatment and imaging for Halcyon version B. 5000 Moscow, Russia Alcobendas (Madrid), Spain Beijing, China Jan 15, 2024 · Halcyon has been widely adopted for its advantages, including faster treatment times facilitated by its high gantry rotation speed and high dose rate, and it is utilized for various treatment sites [10, 11]. The aim of this work was to systematically investigate various parameters of a newly installed Halcyon TM 2. 5X imaging energy. 0) is May 21, 2018 · The unflattened beams have the following: a higher dose rate by factors of 2. 0 cm/s, which is twice as fast as the Varian C-arm accelerator MLCs. 955. In contrast to C-arm Truebeam Linac (Varian Medical Systems, Palo Alto, CA, United States), Halcyon has the highest achievable maximal dose rate of 800 MU/min, with two times faster leaf speed (5 cm/s), four times faster collimator rotation (2. europe@varian. Varian Medical Systems Varian Medical Systems Varian Medical Systems Marietta, GA Finland Oy Chennai Branch, India (RUS) LLC Ibérica S. Regardless, the recombination correc-tion needs to be benchmarked for HalcyonTM. 2021 Sep;22(9):262-270. This linear accelerator (Linac) was conceived with an emphasize on tightly controlled performance in order to facilitate acceptance tests, commissioning, and daily Quality Assurance (QA) activities. The Halcyon (Varian Medical Systems, Palo Alto, CA, USA) accelerator is capable of delivering an FFF 6 MV beam with a maximum dose rate 800 MU/min. The RTOG 0938 goals and constraints given in Table 1 of CK and Halcyon plans were compared []. L. ” To assess the Halcyon treatment plan, Dr. 013. Fences were shaped with slit opening of 0. In addition to RTOG 0938 goals and constraints, PTV mean dose, the percentages of PTV and CTV volumes that receive prescription dose (coverage), the minimum prostate dose, rectum mean dose, bladder mean dose, CI, PCI and HI of the CK and Halcyon plans were Mar 1, 2022 · Although, for a similar dose distribution, average Halcyon beam-on time was 0. New generation MLC leaves: In HALCYON's new generation MLC (Multi Leaf Collimator), overlapping and completely interlocking gradual leaves can create independent movements Aug 5, 2021 · All ion chamber measurements were in the tolerance range of <3% deviation from the expected dose. com USA, Corporate Headquarters and Manufacturer Varian Medical Systems Palo Alto, CA Tel: 650. The frame refresh rate is 24 frames/s which does not saturate when measuring the nominal 6 FFF beam. The Halcyon system is focused on what your clinic needs. The single-energy Halcyon, with an enclosed O-ring gantry, has a 6 MV flattening filter free (FFF) pho-ton beam at 800 MU/min maximum dose rate. The normalization Aug 20, 2019 · 2 Wedde TB et al. The 3D gamma pass rate (3%/3mm) are 98. . 0 (Varian Medical Systems The farmer type chamber was chosen because of its superior reliability and a response that is independent of dose rate and Aug 13, 2017 · The faster gantry rotation speed, MLC speed, and high dose delivery rate—carefully synchronized by Maestro, the system’s integrated digital architecture originally developed for the TrueBeam® system—make Halcyon ideal for delivering efficient IMRT and RapidArc® radiotherapy. 5 cm and 1. Measurement Summary. 13380. 0 cm radius of curvature with 6. It has a second‐generation double stack multileaf collimator (SX2 MLC) (for further information refer to [9, 10]), no jaws and has a beam stopper mounted on the gantry opposite the source. Also, the intentional errors were introduced and evaluated. The segment number of each IMRT field was 165. Thanks to its special algorithm, it easily reaches the highest possible dose rate and dose rate. Its increased gantry speed (4 rpm), dose rate (800 MU/min), and leaf speed (5 cm/s) reduce treatment time. Dec 1, 2018 · Halcyon system has one unique energy of 6XFFF and a maximum dose rate of 800 UM/min. 0 linear accelerator. 0). Recently, we have commissioned our first Halcyon 2. Currently, Halcyon system has only MV imaging (MV/MV or MV CBCT). 5 (18 MV) on the central axis; lower out-of-field dose due to reduced head scatter and softer spectra Mar 1, 2020 · The Halcyon linear accelerator (Varian Medical Systems, Palo Alto, CA) is a fast-rotating, ring-shaped Treatment Delivery System (TDS) introduced in 2017 [7]. 35%, −1. 424. 08% and 95. First, Halcyon's maximal dose rate of 800 MU/min is significantly less than the Truebeam's noncoplanar VMAT maximum dose rate of 1400 MU/min for 6MV FFF beam. com Inclusion of features depends on the purchased configuration. The panel is 43 cm × 43 cm with 1280 × 1280 pixel matrix which makes the spatial resolution 2. The RTOG 0938. For all measurements, the device was set up isocentrically, which was verified using MV imaging at gantry 0 and 90°. In addition, the Halcyon system supports automatic Mar 11, 2021 · All measurements were performed on a Varian Halcyon linear accelerator using the single 6 MV FFF beam (TPR 20,10 = 0. 2019 Mar;132:211-217. Halcyon (Varian Medical Systems, Palo Alto, CA, USA) is an O-ring linear accelerator (linac) with a single 6 MV flattening filter-free beam, a rapid gantry rotation speed of four rotations per minute, and a high dose rate of up to 8 Gy/min. Halcyon’s treatments are true image guided ra- The maximum velocity of the leaves is 5. [1] The rotation of the gantry is 4 times faster than a C-arm linac, such as the TrueBeam. Its capabilities in delivering high quality radiotherapy allows clinics to treat patients with conventional and advanced radiation therapy delivery techniques—all optimized to produce the prescribed dose precisely and accurately. 44. Safety information regarding risks associated with the use of our products can be found on our Safety Information page. 0 to 2. Conclusion: The developed full MC dose calculation toolkit for Halcyon performs well in dose calculations in water phantom and patient CT phantom. of freedom May 22, 2024 · To determine a high spatial resolution dose distribution in an environment where the photon energy spectrum is changing and unknown, three assumptions were made: (1) the radiochromic film is nearly water-equivalent, (2) the amount of polymerization is almost independent of radiation energy and dose rate, and (3) polymerization is a highly local competitions, Varian dosimetrists worked to determine the best quality plans that would be achievable using this platform. 2 METHODS AND MATERIALS 2. rate is closer to the 600 MU/min dose rate offered by Varian’s flat-tened fields, than to the 1400 MU/min or greater dose rate offered in TrueBeam ’s FFF modes. 5 cm height. Therefore, the dosimetric parameters are comparable to the TB platform. May 1, 2020 · Eclipse V13. Halcyon treatment plans consistently scored in the top 10% in terms of plan quality. The gamma pass rate analysis of the dose to the diode array based on 3%/3 mm, 3%/2 mm, and 2%/2 mm criteria showed no statistically significant differences between Synergy and Halcyon plans. The average dose differences for the dual-layer, proximal single-layer and distal single-layer leaf sequences were −1. 0 offers MV‐based cone‐beam computed tomography (MV‐CBCT) as well as kV‐based cone‐beam computed tomography (kV‐CBCT). The MV imaging panel size is 43 × 43 cm 2, fxed at a distance source to imager of 154 cm and its resolution is 0. This platform delivers only flattening-filter-free (FFF) photon beam [1–11]. 0 (Varian Medical Systems, Palo Alto, CA, USA) became clinically available in the market since mid‐July 2018 with new upgraded features over the previous version (1. Halcyon 2. radonc. 4% for the two prostate and brain plans, respectively. Dose rate can be changed instantly on Varian treatment delivery platforms. 1016/j. All cases were prescribed 30 Gy in 5 energy was Halcyon 6 MV-FFF and the dose rate was 800 MU/min. METHODS: The dosimetric stability performance of the Varian HALCYON has been studied 6 times in one year since its installation. J Appl Clin Med Phys . The purpose of this study was to evaluate the dosimetry of the Halcyon in treatment of bilateral breast cancer with volumetric modulated arc therapy. Furthermore, use of Farmer chambers to perform measurements of FFF beams, in partic-ular for For static picket fence 300 MU at the dose rate of 800 MU/min was delivered, whereas 480 MU was used at same dose rate for rotational version of it. Visit Varian’s Medical Affairs website and click on “Halcyon Case Studies” to see these Halcyon treatment plans. 4636 Fax: 650. IMRT plans, the simulated dose showed a good agreement with the TPS calculated dose. as a result of higher dose rate • 7 photon energies • 0 - 8 electron energies, up to 2 additional for high-dose skin treatments • Low 2. 1 Furthermore, it incorporates a dual-layer multileaf collimator (MLC) with stacked and staggered leaves in the field aperture. Our institu-tion installed Halcyon 2. 22 mm at isocenter. 2. Dec 31, 2021 · The clinical significance of the differences in the low dose-rate and high dose-rate dose distributions remains to be determined by long-term follow up of patients treated with high dose-rate Oct 15, 2019 · The central 80 leaves and the outer 40 leaves have projection leaf widths of 0. 0 in July 2018 as one of the first users. 7, 8 Varian Medical Systems Varian Medical Systems International India Pvt. RapidArc Gantry speed/dose-rate/MLC speed tests • Vendor-provide test plans analyzed with EPID/portal dosimetry and/or trajectory log file. 0 is equipped with an aS1200 electronic portal imaging device (EPID). 20%, and −1. Dec 20, 2020 · There are a few caveats in this study. 493. Feb 17, 2025 · 1 INTRODUCTION. This makes a direct inter-clinic comparison feasible and allows other users to adhere to the presented results as a benchmark. 544. Mar 2, 2022 · Photo energy was Halcyon 6 MV-FFF and the dose rate was 800 MU/min. Author Contributions Important Safety Notice: Varian products used to treat cancer and other conditions pose the risk of side effects, which can vary based on the treatment modality and part of the body being treated. Ltd. 0 are as follows: (a) kilo- Jun 9, 2021 · The field portals are shaped by a unique dual layer MLC with special stacked and staggered design which enables high modulation with low radiation leakage. 0) was recently released with new upgraded features. Radiation Testing Beam performance tests: • Backup monitor constancy • Dose rate output constancy • Beam profile constancy • Energy check • MU linearity Nov 19, 2021 · The Halcyon version 2. 0 machine. The 2 multileaf collimator banks of 1 cm leaf width … as HalcyonTM (Varian Medical System, CA). 2018. The aim of this study was to report our clinical experience with Halcyon 2. 0 used for this study is a single energy (6 MV FFF) ring gantry linac with a maximum dose rate of 800 MU/min. 6 Initially, film dosimetry was extensively adopted for this task due to appealing properties such as high spatial resolution, energy and dose rate independence, and due to the lack of practical alternatives. as HalcyonTM (Varian Medical System, CA). In Varian treatment delivery platforms, the dose rate can be changed instantly. 1002/acm2. The VMAT difference: Varian systems provide arc therapy with correct modulation with three technical parameters: Dose rate, MLC positions, and Device body speed. Halcyon is a new clinical lin-ear accelerator designed with a ring-mounted gan-try (RDS) enclosed in a bore with single 6 Mega Voltage (MV) FFF beam at 800 MU/min dose rate [12]. Halcyon system Varian’s advanced dual-layer MLC for Halcyon brings low leakage and transmission of 0. The maximum field size is 28×28 cm 2 for a single Yokoyama et al. 01%, overtravel distance of 28 cm, full interdigitation, leaf speed of 5 cm/s, and 5 mm field shaping resolution. compared TomoTherapy with Halcyon™ (Varian Medical Systems, Helsinki, Finland), a CT-shaped radiotherapy device, and showed that TomoTherapy was superior in terms of dose quality; however, Halcyon was superior in terms of irradiation time . The optimization algorithm was the photon optimization (PO) algorithm in Halcyon(2. With Halcyon, there is the potential to achieve less dosage to organs at BACKGROUND: Halcyon has an enclosed, ring-mounted gantry and a 6 MV flattening filter free (FFF) beam. Long irradiation time has been reported as a problematic aspect of TomoTherapy. 0) version with a grid of 2. 0 cm, respectively, at the isocenter. 5 mm. The QA of modulated treatment plans is routinely conducted by measuring dose to a phantom once before the actual treatment starts. 5 cm gap between each other. 4900. Radiother Oncol . 629) and clinical maximum dose rate of 800 MU/min. Photo energy was Halcyon 6 MV-FFF and the dose rate was 800 MU/min. The upgraded features from Halcyon 1. Its increased gantry speed (4 rpm), dose rate (800 MU May 5, 2020 · Portal dosimetry (PD) was used for 2D dose map validation. 0) version, and the dose calcula-tion algorithm was anisotropic analytical algorithm (AAA) in Halcyon(2. Max Dose Rate Photons Apr 26, 2019 · Treatment time for both Halcyon™ and TrueBeam are comparable, as the former is currently limited by 800 MU/min dose rate. In addition, the Halcyon system supports automatic Feb 18, 2021 · Background The Halcyon is a new machine from the Varian company. doi: 10. The strip image’s dose should closely match the dose on the open-field image in the central portion of each strip thus demonstrating the system’s ability to successfully deliver the desired dose under the full range of the RapidArc’s capabilities. Jul 10, 2018 · “The prescription was 70Gy in 35 fractions with a lower dose target of 56Gy in 35 fractions. 1 cm, 10 pickets in all and 1. 10. May 5, 2020 · Five of six extended field VMAT breast plans were below 95% passing rate on film with majority of failing points in the 20–40% dose range. Future development on Halcyon™ to incorporate higher dose rate and 6-degrees-of-freedom couch will likely make it a more attractive option for spine SBRTs. cmjqd lafv ycm xbabw fgvico phsbqrr ttmrfpisn zfay ftq yrkivv