For cine image acquisition during treatment we used an amorphous silicon EPID (aS1000, Varian Medical Systems) mounted on the Clinac iX. The EPID had an active area of 40×30 cm that contained 1024×768 pixels. The EPID images were acquired at 7.5 frames per sec (20 frames per one EPID image). We routinely acquired EPID cine images of all treatment ports in all treatment sessions. In patients treated before September 2010 we were unable to obtain EPID cine images of the same port as was used for portal image acquisition before treatment (the gantry angle was 180° in most patients), and therefore, we did not have EPID images of all sessions.
As1000
Manufactured by Agilent Technologies
Sourced in United States
The AS1000 is a high-performance autosampler designed for liquid chromatography (LC) and gas chromatography (GC) applications. It features a compact design, precise sample injection, and high sample capacity to improve workflow efficiency in analytical laboratories.
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Lab products found in correlation
4 protocols using as1000
1
EPID Cine Imaging for Radiotherapy Monitoring
2
EPID Spatial Characteristics and Beam Measurements
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EXAMPLE 1
In various examples, measurements were performed with an amorphous silicon EPID aS1000 mounted on TrueBeam linear accelerator (Varian Medical systems, Palo Alto, Calif., USA). The aS1000 spatial resolution is 1024×768 pixels covering an active detector area of 40×30 cm2. The dimensions of a single detector pixel are 0.039×0.039 cm2. The aS1000 EPID has a maximum off-axis shifts equal to 15, 16, 6, and 7 cm in the +x, −x, +y, and −y directions, in the linear accelerator coordinate system, respectively. In the z-axis, the maximum and minimum SIDs are 183 and 95 cm, respectively. EPID measurements were acquired at SIDs equal to 100, 150 and 180 cm for 6, 10, and 15 MV beams with flattening filters (WFF) in addition to 6 and 10 MV flattening filter free (FFF) beams.
3
Varian aSi EPID for Planar Radiography
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The Varian aS1000 (PortalVision, Varian Medical Systems, Palo Alto, CA) 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 EPID distances from 95 cm to 180 cm, with an active imaging area of 40 × 30 cm (8) The image matrix is created from an array of 1024 × 768 390 μ m (9) The EPID has an acquisition rate of 9.574 frames/s, photon energy range of 4–25 MV, and permitted dose rates of 50–600 MU/min.(10) While the EPID can be operated in various acquisition modes, a single exposure, 6 MV planar radiographic mode was used in this study.
4
Characterization of aSi EPID System
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The EPID used in our study is a commercially available aSi imaging device (aS1000 from Varian Medical Systems, Palo Alto California, USA) mounted on a Clinac 2100 C/D (photon energies of 6 and 15 MV) with 120 leaves dynamic MLC (Varian Medical Systems). Recently, c-series linac machine had been upgraded to deliver 6MVFFF (TPR 20, 10 = 0.6336 ± 0.005) beam along with the existing 6 MV and 15 MV nominal energies. The EPID system includes, (i) an image detection unit, consist of the detector and accessory electronics, (ii) an image acquisition unit (IAS3), contains drive and acquisition electronics and interfacing hardware, and (iii) an integrated workstation with TPS (portal dosimetry). The aS1000 EPID detector system is mounted on the robotic support arm called E-arm, which uses mechanical breaks for placing the detector to an accurate and reproducible position. The E-arm allows the detector to be positioned at 95-180 cm from the radiation focus point and the detector has a 40 cm × 30 cm active imaging area at 100 SDD. The aS1000 has an active imaging area with 1024 × 768 pixel matrix. The EPID has a pixel resolution of 0.39 mm and is capable of capturing 14-bit images at 30 fps (frames per se cond) with IAS3.
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