Synchrotron radiation cine K-edge energy subtraction coronary arteriography using an iodine filter method

Takeda, Takeshi; Itai, Yuji; Yoshioka, Hiroshi; Umetani, Keiji; Ueda, Kazuhiko; Akisada, Masayoshi

doi:10.1007/bf02524704

Cited by 8 publications

(1 citation statement)

References 17 publications

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“…Line-scanning systems with dual X-ray beams have been developed and improved for human clinical studies by American and German groups (Thompson et al, 1994;Dix et al, 1992). On the other hand, two-dimensional imaging systems using an X-ray image intensifier have been employed for real-time imaging in Japan (Fukagawa et al, 1989;Umetani et al, 1991;Takeda et al, 1994). In the dual-energy method, pairs of images at energies higher and lower than the iodine K edge are taken and are used to produce subtraction images.…”

Section: Imaging Systemmentioning

confidence: 99%

High-Spatial-Resolution Medical-Imaging System Using a HARPICON Camera Coupled with a Fluorescent Screen

Umetani¹,

Ueki²,

Ueda³

et al. 1996

J Synchrotron Radiat

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A high-sensitivity HARPICON camera was developed for medical X-ray imaging using a fluorescent screen. It is an avalanche-multiplication-type image pick-up tube and is 32 times more sensitive than conventional tubes. The camera also has a wider dynamic range than conventional medical-imaging cameras because a maximum output signal current of 2.3 muA is obtained and, in high-illumination-intensity regions, photocurrent is not proportional to illumination intensity. The fluorescent screen is an intensifying screen of the type used for radiographic screen-film combinations in medical examination. An X-ray image on the screen is focused on the photoconductive layer of the pick-up tube using a coupling lens with f/0.65. Experiments were performed using monochromated X-rays at the Photon Factory. An image of a spatial resolution test chart was taken in a 525 scanning-line mode of the camera. The chart pattern of 5 line-pairs mm(-1 )(spatial resolution of 100 mum) was observed at an X-ray input field of 50 x 50 mm. Real-time digital images of the heart of a 12 kg dog were obtained at a frame rate of 60 images s(-1) after injection of a contrast medium into an artery. The images were stored in digital format at 512 x 480 pixels with 12 bits pixel(-1). High-spatial-resolution and high-contrast images of coronary arteries were obtained in aortography using X-rays with energy above that of the iodine K edge; the image quality was comparable with that of conventional selective coronary angiography.

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Section: Imaging Systemmentioning

confidence: 99%