Dose reductions in dental X-ray imaging using Medipix

Watt, J.S.; Davidson, D. W.; Johnston, Christina; Smith, C.J.M.; Tlustos, L.; Mikulec, B.; Smith, K. M.; Rahman, M.

doi:10.1016/j.nima.2003.08.003

Cited by 37 publications

(21 citation statements)

References 9 publications

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“…Comparison between photon-counting detectors (e.g., Medipix1) and CCD used within dentistry for diagnostic imaging, demonstrated dose reductions without loss of resolution contrast 79 . Further research revealed an increase in contrast of 18% is possible with the Medipix2 78 .…”

Section: Spectralmentioning

confidence: 99%

Surfing the spectrum – what is on the horizon?

et al. 2013

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Section: Spectralmentioning

confidence: 99%

Surfing the spectrum – what is on the horizon?

et al. 2013

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“…This implies high absorption and charge collection efficiency of the sensor as well as good noise performance of the readout chain. Direct detection and quantum processing are beneficial as well [7][8][9]. It is evident that the system has to possess as well sufficient counting rate capability.…”

Section: Detector Requirements In Medical Imaging Applicationsmentioning

confidence: 99%

X-ray imaging using single photon processing with semiconductor pixel detectors

Mikulec

Campbell

Heijne

et al. 2003

Nuclear Instruments and Methods in Physics Research Section A:

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More than 10 years experience with semiconductor pixel detectors for vertex detection in high energy physics experiments together with the steady progress in CMOS technology opened the way for the development of single photon processing pixel detectors for various applications including medical X-ray imaging. The state of the art of such pixel devices consists of pixel dimensions as small as 55 × 55 µm 2 , electronic noise per pixel <100 e − rms, signal-to-noise discrimination levels around 1000 e − with a spread <50 e − and a dynamic range up to 32 bits per pixel. Moreover, the high granularity of hybrid pixel detectors makes it possible to probe inhomogeneities of the attached semiconductor sensor.

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“…A number of breast imaging applications can benefit from the development of fast energy resolved single photon counting detector arrays including digital mammography (DM), digital breast tomosynthesis (DBT), and breast computed tomography (CT) 1,2,3,4,5,6,7,8 . Energy resolved photon counting can provide reduced dose through optimal energy weighting, compositional analysis through multiple basis function material decomposition, and contrast enhancement through spectroscopic x-ray imaging of metal nanoparticles 9,10,11,12,13,14,15 . Due to the extremely high flux can occur in medical x-ray imaging, energy integrating detectors with a large dynamic range and good detection efficiency have conventionally been used but they do not provide accurate information about the number of or energy of the individual x-rays.…”

Section: Introductionmentioning

confidence: 99%

Energy dispersive photon counting detectors for breast imaging

et al. 2013

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We report on our efforts toward the development of silicon (Si) strip detectors for energy-resolved clinical breast imaging. Typically, x-ray integrating detectors based on scintillating cesium iodide CsI(Tl) or amorphous selenium (aSe) are used in most commercial systems. Recently, mammography instrumentation has been introduced based on photon counting silicon Si strip detectors. Mammography requires high flux from the x-ray generator, therefore, in order to achieve energy resolved single photon counting, a high output count rate (OCR) for the detector must be achieved at the required spatial resolution and across the required dynamic range for the application. The required performance in terms of the OCR, spatial resolution, and dynamic range must be obtained with sufficient field of view (FOV) for the application thus requiring the tiling of pixel arrays and scanning techniques. Room temperature semiconductors, operating as direct conversion x-ray sensors, can provide the required speed when connected to application specific integrated circuits (ASICs) operating at fast peaking times with multiple fixed thresholds per pixel, provided that the sensors are designed for rapid signal formation across the x-ray energy ranges of the application at the required energy and spatial resolutions. We present our methods and results from the optimization of prototype detectors based on Si strip structures. We describe the detector optimization and the development of ASIC readout electronics that provide the required spatial resolution, low noise, high count rate capabilities and minimal power consumption.

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Dose reductions in dental X-ray imaging using Medipix

Cited by 37 publications

References 9 publications

Surfing the spectrum – what is on the horizon?

Surfing the spectrum – what is on the horizon?

X-ray imaging using single photon processing with semiconductor pixel detectors

Energy dispersive photon counting detectors for breast imaging

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