Flat x-ray image intensifier system for real-time fluoroscopy

Hiroshi Onihashi; Hiroshi Aida; Kiyumi No; Takashi Noji; Yuichi Murakoshi; Keiichi Saito; Junsuke Koma

doi:10.1117/12.384487

25 April 2000 Flat x-ray image intensifier system for real-time fluoroscopy

Hiroshi Onihashi, Hiroshi Aida, Kiyumi No, Takashi Noji, Yuichi Murakoshi, Keiichi Saito, Junsuke Koma

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384487
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

A new flat X-ray image intensifier (Flat II) system, using a large-area electron multiplier for applications in real-time fluoroscopy imaging, is under development by the authors. The Flat II system, mainly consists of two devices; the image processing equipment and the image acquisition system by charge-coupled-device (CCD) camera. The image processing is performed as follows. The X-ray is converted to visual light by cesium iodide scintillator and to electrons by photo- cathode. A large-area electron multiplier is located adjacent to the photo-cathode, and amplifies electron current up to a few hundred times. Amplified electrons are again converted to bright visual image by the output phosphor screen. The bright visual image is subsequently detected with a CCD camera system. The electron multiplier used for present work is that of metal-dynode array construction. The principle of metal- dynode electron multipliers is well known. Since it is technically difficult to make the electron multiplier with a fine pitch, sufficient resolution could not be obtained until now. However, we could manufacture that of 6-inches (15 cm) size with 0.3 mm and 0.2 mm pitch, and manufactured the prototype Flat II system using the 0.3 mm pitch multiplier as an experiment. We acquired the fundamental characteristics and the image quality of prototype Flat II system. In this paper, the physical characteristics such as modulation transfer function (MTF), signal-to-noise ratio (SNR), etc. are discussed.

Citation Download Citation

Hiroshi Onihashi, Hiroshi Aida, Kiyumi No, Takashi Noji, Yuichi Murakoshi, Keiichi Saito, and Junsuke Koma "Flat x-ray image intensifier system for real-time fluoroscopy", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384487

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KEYWORDS

Modulation transfer functions

CCD cameras

Imaging systems

X-rays

Fluoroscopy

Distortion

Signal to noise ratio

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