Web Newswire: DALSA announced Xineos-1313-EO CMOS X-Ray detector panel designed to operate at full resolution frame-based panoramic dental imaging at frame rates exceeding 300 fps, as well Medium Field of View (MFOV) Cone Beam CT applications at 30 fps. The panel resolution is not clear from the announcement.
They claim lowest read noise and sesnitivity down to single x-ray photons
ReplyDeletehttp://www.dalsa.com/ls/products/cameras/family.aspx?fam=Xineos
The number of electrons that a 100 kV x-ray photon produces is 10 times more than what a 10 kV x-ray photon produces. I'm interested to know what the read noise is in terms of electrons in order to determine what energy this single photon sensitivity is at.
To me 300 fps seems excessively high for dental imaging. Does anyone know if there is a reason for going to this rate?
ReplyDeleteThe comparisons seem to all be drawn against amorphous silicon panels (the "other standard technologies"). Noise in those panels is tyoically a few hundred electrons, which makes single x-ray photon detection only marginally possible. Wafer-based sensrs should have noise similar to other CMOS devices - probably in the 50-electron range. However, single-photon detection is not particularly useful in general fluoroscopic imaging because the flux rates necessary to get decent S/N is a reasonable time preclude counting anyway.
ReplyDeleteThe high frame rates are for panoramic dental imaging where only a small strip is exposed in each frame (10 x 130 mm in the case of this product) as the panel is moved around the head. The higher frame rate lessens the chance of significant head motion during exposure.
due to the quantum yield being greater than one the shot noise really degrades the SNR in sensors that directly sense Xrays as I understand. I would think they'd get a better image using a scintillator to down-convert to perhaps green light....
ReplyDeleteis that practical for dental apps?
Ah! Thanks.
ReplyDeleteThese don't directly detect x-rays. They have CsI scintillators.
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