Motion artifact seen on slot-scanning direct digital mammography.

Boyle, E R; Pak, Daehyun; Williams, Judith L.

doi:10.2214/ajr.172.3.10063863

Cited by 6 publications

(2 citation statements)

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“…As a result, the SSDR method had a high probability of producing a motion artifact. However, a previous study demonstrated that motion in a brief period degraded only a small segment of slot scanner image, while it affects the entire portion of CR image (18). Continuous motion throughout the image acquisition period caused an artifact that was less apparent with the SSDR method than with the CR method.…”

Section: Discussionmentioning

confidence: 99%

Slot-Scan Digital Radiography of the Lower Extremities: a Comparison to Computed Radiography with Respect to Image Quality and Radiation Dose

et al. 2009

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ObjectiveTo compare the slot-scan digital radiography (SSDR) of the lower extremity region and the computed radiography (CR) method with respect to the image quality and radiation exposure.Materials and MethodsWe enrolled 54 patients who underwent both the SSDR and CR of the lower extremities. The study evaluated and statistically compared the image quality of four features (outer cortex, inner cortex, trabeculae and intermuscular fat) at six different levels (pelvis, hip, femur, knee, tibia and ankle) between each method. The image quality was evaluated using a visibility scale, and the entrance skin dose was measured using a dosimeter at three different levels of a phantom (hip, knee, and ankle).ResultsThe mean image visibility scale values for the SSDR method were significantly higher than for the CR method. The entrance skin dose for the SSDR method was 278 µGy at each level, compared to the entrance skin doses of the CR method, which were 3,410 µGy for the hip, 1,152 µGy for the knee, and 580 µGy for the ankle.ConclusionBoth the image quality and patient entrance skin dose data suggest that the SSDR method is superior to the CR method for the lower extremity musculoskeletal examination.

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Section: Discussionmentioning

confidence: 99%

Slot-Scan Digital Radiography of the Lower Extremities: a Comparison to Computed Radiography with Respect to Image Quality and Radiation Dose

et al. 2009

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“…The possibility of motion artifacts due to long image acquisition time has previously been investigated and shown to be insignificant. 13,14 A number of scanning slit x-ray imaging systems are currently under investigation for mammography 15,16 and general radiography. 17 Recently, we have reported the initial results for a scanning slit x-ray imaging system based on an ''edge-on'' MCP detector.…”

Section: Introductionmentioning

confidence: 99%

Scanning‐slit photon counting x‐ray imaging system using a microchannel plate detector

Shikhaliev

Lê

et al. 2004

Medical Physics

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An experimental prototype of a novel photon counting x-ray imaging system was evaluated. This system is based on an "edge-on" microchannel plate (MCP) detector and utilizes scanning slit imaging configuration. The detector is capable of photon counting, direct conversion, high spatial resolution, controllable physical charge amplification, quantum limited and scatter free operation. The detector provides a 60 mm wide field of view (FOV) and its count rate is 200 kHz for the entire FOV. The count rate of the current system is limited by the position encoding electronics, which has a single input for all events from the entire detector, and incorporates a single channel ADC with 1 micros conversion time. It is shown that the count rate can potentially be improved to clinically acceptable levels using multichannel application specific integrated circuit (ASIC) electronics and multi-slit image acquisition geometry. For a typical acquisition time used in this study, the image noise was measured to be less than the typically acceptable noise level for medical x-ray imaging. It is anticipated that the noise level will be also low after the implementation of the ASIC electronics. The quantum efficiency of the detector was measured to be 40%-56% for an energy range of 50-90 kVp for MCPs used in this study and can be improved to > 80% using MCPs with the optimized parameters. Images of resolution and anthropomorphic phantoms were acquired at an x-ray tube voltage of 50 kVp. The value of contrast transfer function for the detector was measured to be 0.5 at a spatial frequency of 5 lp/mm. The intrinsic spatial resolution of the system is 28 microm FWHM and was limited by the accuracy of the time-to-digital conversion of the position encoding electronics. Given the advantages of the edge-on MCP detector such as direct conversion and physical charge amplification, it can potentially be applied to mammography and chest radiography.

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