High-resolution video-based EPID for cone beam CT

Farhad A. Ghelmansarai; Ali R. Bani-Hashemi; Juan Carlos Celi; Paco Hernandez; Ed Calderon; Matthias M. Mitschke

doi:10.1117/12.480484

5 June 2003 High-resolution video-based EPID for cone beam CT

Farhad A. Ghelmansarai, Ali R. Bani-Hashemi, Juan Carlos Celi, Paco Hernandez, Ed Calderon, Matthias M. Mitschke

Proceedings Volume 5030, Medical Imaging 2003: Physics of Medical Imaging; (2003) https://doi.org/10.1117/12.480484
Event: Medical Imaging 2003, 2003, San Diego, California, United States

Abstract

A high-resolution video (HRV) based EPID that is capable of matching the high spatial resolution and SNR (signal to noise ratio) of a-Si flat panel devices was developed at Siemens OCS (Oncology Care Systems) for cone beam CT. This system is using a high resolution CCD camera (1300 x 1030). The optical components and scintillator screen were modified to generate high-resolution images. A Pips-Pro QC3 phantom was used to compare the spatial resolution and the contrast to noise ratio (CNR) of a-Si flat panel (1024x1024) and HRV system. The QC phantom was placed at the linear accelerator iso-center, and the detectors were placed 40cm below iso-center. The measured f50 for the Siemens a-Si flat panel and HRV are 0.49 lp/mm, and 0.43 lp/mm; respectively. The image of the flat panel had already been corrected for Offset, Gain and Defective pixels; however, no correction was performed on the HRV system. Due to the fast readout of HRV, small pixel size, and adjustable camera lens aperture, a thicker scintillator screen would have resulted in an increase in SNR without sensor saturation during radiation treatment imaging. This is one of the main advantages of this system compared to the flat panels, and it makes the system ideal for cone beam reconstructions as well as regular therapy imaging. A new electronic readout is implemented in HRV control circuit that will synchronize the image acquisition with the linear accelerator, and thereby increases the SNR.

Citation Download Citation

Farhad A. Ghelmansarai, Ali R. Bani-Hashemi, Juan Carlos Celi, Paco Hernandez, Ed Calderon, and Matthias M. Mitschke "High-resolution video-based EPID for cone beam CT", Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); https://doi.org/10.1117/12.480484

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KEYWORDS

Amorphous silicon

Sensors

Signal to noise ratio

Cameras

Imaging systems

Scintillators

Spatial resolution

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