Iviewgt

Manufactured by Elekta

Sourced in United Kingdom

The IViewGT is a state-of-the-art imaging system designed for radiotherapy applications. It provides high-quality imaging capabilities to support accurate patient positioning and treatment delivery. The core function of the IViewGT is to capture and process real-time images during radiotherapy procedures, enabling clinicians to monitor and verify the patient's position throughout the treatment process.

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Lab products found in correlation

Versa hd, by Elekta (2 mentions) Agility mlc, by Elekta (1 mentions) Versa hd linear accelerator, by Elekta (1 mentions) Pinnacle v 9, by Philips (1 mentions)

6 protocols using iviewgt

Comprehensive Evaluation of Elekta Linac Performance

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Measurements were carried out on two Elekta Versa HD linear accelerators (Elekta AB, Stockholm, Sweden) using 6MV and 15MV high energy photon beams with flattening filter (WFF) and 6MV and 10MV high energy flattening filter free (FFF) photon beams. FFF beams were not in clinical use at the time of testing and were not optimized in terms of the focal spot position. The linacs were equipped with the iViewGT megavoltage (MV) portal imaging system, with the MV EPID panel consisting of 1024 × 1024 pixels (pixel size is 0.4 mm), and the Elekta X‐ray Volume Imaging (XVI) system for kilovoltage (kV) diagnostic imaging, with the kV EPID panel consisting of 512 × 512 pixels (pixel size is 0.8 mm). The MV EPID panel was positioned at the nominal distance of 160 cm from the radiation source. The linacs were equipped with the Elekta Precise treatment table used for patient treatment support and positioning.
The linacs could also be equipped with the add‐on Aktina (Aktina Medical Corporation, Congers, NY, USA) cones (circular small field collimators) for precise photon beam collimation required for specialized treatment techniques such as stereotactic radiosurgery (SRS) or stereotactic body radiotherapy (SBRT). In this study, one cone size of 27 mm diameter was used.

Chojnowski J.M., Sykes J.R, & Thwaites D.I. (2021). A novel method to determine linac mechanical isocenter position and size and examples of specific QA applications. Journal of Applied Clinical Medical Physics, 22(7), 44-55.

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Elekta iViewGT Flat Panel Imaging Characterization

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The Elekta iViewGT (Elekta, Crawley, UK) is an amorphous silicon flat panel imaging device mounted on a robotic arm designated at C in Fig. 1. This arm allows the detector to be positioned at source to electronic portal imaging device (EPID) distance of 160 cm with an active imaging area of 41 × 41 cm.9 The image matrix is created from an array of 1024 × 1024 photodiodes with a pitch of 400 μm.10 While the EPID can be operated in various acquisition modes, a single exposure, 6 MV planar radiographic mode was used in this study.

Stanley D.N., Rasmussen K., Kirby N., Papanikolaou N, & Gutiérrez A.N. (2018). An evaluation of the stability of image quality parameters of Elekta X‐ray volume imager and iViewGT imaging systems. Journal of Applied Clinical Medical Physics, 19(3), 64-70.

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Elekta Axesse Linear Accelerator MLC Calibration

Cited 3 times

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The maximum possible field size deliverable in the Elekta Axesse linear accelerator is 21 cm × 16 cm. Treatment fields are defined in Elekta Axesse only by the MLC system as there are no backup jaws. All delivered fields were acquired in the amorphous Si EPID called iView GT (Elekta, Stockholm, Sweden). The iView GT EPID can acquire signals in an area of 26 cm × 26 cm. Images are acquired in an array of 1024 × 1024 pixels with a resolution of 400 μm at the imager level and of 250 μm at the isocenter. The EPID was precalibrated for systematic shifts and tilts to ensure that there was no confounding motion bias. Two different methods followed for MLC calibration: First, a major calibration, followed by a minor calibration. These methods are Elekta-defined and described elsewhere.[10 (link)11 (link)12 (link)13 (link)] Although the specified MLC leaf position accuracy in Elekta Axesse is 1 mm, which is on par with the recommendations of the American Association of Physicists in Medicine Task group report 142 (TG-142), experiments at the utilized MLC calibration methodology reveals that the system can achieve a far better accuracy level in the sub-millimeter range.[14 (link)15 (link)16 (link)]

Roy S., Sarkar B, & Pradhan A. (2021). Determination of Multileaf Collimator Positional Errors as a Function of Dose Rate, Speed, and Delivery Interruption for Volumetric-Modulated Arc Therapy Delivery. Journal of Medical Physics, 46(4), 286-294.

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EPID Calibration and Dose Quantification

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The EPID (an amorphous silicon EPID; Elekta iView GT) has a sensitive area of 41 cm × 41 cm in size, consisting of 1024 × 1024 pixels of 0.4 × 0.4 mm² and a nominal source‐detector distance of 160 cm.²², ²³ The measured EPID images were converted into dose matrices using a calibration procedure and an existing methodology primarily developed by Lee et al.,²⁴, ²⁵ and Matlab computer code outlined elsewhere.²⁶ (more details can be found in our previous EPID experimental study).¹⁸

Alharthi T., Vial P., Holloway L, & Thwaites D. (2021). Intrinsic detector sensitivity analysis as a tool to characterize ArcCHECK and EPID sensitivity to variations in delivery for lung SBRT VMAT plans. Journal of Applied Clinical Medical Physics, 22(6), 229-240.

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Linear Accelerator Performance Evaluation

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Measurements were performed on a VersaHD linear accelerator (Elekta AB, Stockholm, Sweden) equipped with an Agility MLC (5 mm leaf width). Also available was the MV imaging acquisition software iViewGT™ (Elekta AB, Stockholm, Sweden) with an amorphous silicon EPID (PerkinElmer XRD 1642 AP) which is situated at 160 cm distance from the linac target. The EPID panel has a detection area of 41 × 41 cm² (1024 × 1024 pixels). Treatment plans with all available energies (6 MV, 10 MV, 6 MV FFF, and 10 MV FFF) were generated with Pinnacle V9.10 (Philips Medical Systems, Eindhoven, The Netherlands).

Olaciregui‐Ruiz I., Vivas‐Maiques B., Kaas J., Perik T., Wittkamper F., Mijnheer B, & Mans A. (2019). Transit and non‐transit 3D EPID dosimetry versus detector arrays for patient specific QA. Journal of Applied Clinical Medical Physics, 20(6), 79-90.

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SBRT Dose Verification with EPID

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All irradiations were performed with Elekta Versa HD™ (Elekta, Stockholm, Sweden) treatment machine. The treatment machine was calibrated to obtain 1 cGy dose at 1.5 cm depth in water equivalent solid phantoms with 1 MU before each irradiation. Setup veri cation was maintained for each model with cone-beam computed tomography (CBCT) images. After the position of the phantom was veri ed, SBRT was started and transit radiation dose information was simultaneously collected by iViewGt (Elekta, Stockholm, Sweden). The collected data was automatically exported to the iViewDose software. iViewDose compares the EPID-reconstructed doses with the TPS doses. 3D gamma evaluation with 3% global dose difference/3mm distance to the agreement and threshold:50% was performed for analysis. The passing rate criteria were described as 90%. Also, the isocenter doses were evaluated and compared for each model. The acceptance criterion was set to 3% for the dose differences.

Yedekci Y., Elmalı A., Demirkiran G., Ozyigit G, & Yazici G. (2022). Transit dosimetry of stereotactic body radiotherapy treatments with electronic portal dosimetry device in patient with spinal implant. Physical and engineering sciences in medicine, 45(4).

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