X-ray imaging and spectroscopy using low cost COTS CMOS sensors

Lane, David W.

doi:10.1016/j.nimb.2011.09.007

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…D CMOS is a Mightex Systems MCE-B013-UW 1.3 Megapixel Windowless Camera with a sheet of aluminum foil placed in front of the CMOS sensor, a design that yields a reliable, energy-resolving X-ray detector. [28][29][30][31][32] It is…”

Section: X-ray Camera D Cmosmentioning

confidence: 99%

“…The windowless construction of the camera is important because most cameras are manufactured with a protective glass sheet glued directly on the CMOS sensor, and glass strongly attenuates X-rays at the relevant energies. This glass sheet can be removed through careful application of heat to break the glue, 28,31 but a simpler solution is to use a windowless camera. A single sheet of standard, storebought aluminum foil is $18 lm thick.…”

Section: -5mentioning

confidence: 99%

“…A histogram of the pixel intensities gives the X-ray energy distribution which can be calibrated using X-ray sources with known energies. [28][29][30][31][32] D CMOS was calibrated using an 87 lCi Co-57 sealed M€ ossbauer source and an 11 lCi Fe-55 stainless steel encapsulated source. Co-57 emits at 6.4, 14.4, and 122 keV, while Fe-55 emits at 5.9 keV.…”

Section: -5mentioning

confidence: 99%

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Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment

2018

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Measurements by multiple X-ray detectors show transient emission of a 1 ls pulse of non-monoenergetic $6 keV X-rays by a cold, dense MHD-driven plasma jet. Because the collision mean free path is much smaller than the jet dimensions, the acceleration of particles to high energy was not expected. The X-ray pulse occurs when the jet undergoes a kink instability which accelerates the jet laterally so that a fast-growing secondary Rayleigh-Taylor instability is triggered which then breaks the jet. The jet breaking is correlated in time with several other fast changing phenomena. It is proposed that despite the short collision mean free path, an inductive electric field associated with this breaking accelerates a certain subgroup of electrons to keV energies without any of these electrons undergoing collisions. It is further proposed that after being accelerated to high energy, these fast electrons are suddenly decelerated via collisions and radiate X-rays.

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Section: X-ray Camera D Cmosmentioning

confidence: 99%

Section: -5mentioning

confidence: 99%

Section: -5mentioning

confidence: 99%

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Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment

2018

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“…In recent years, complementary metal oxide semiconductor (CMOS) cameras have been used for X/γ-ray detection and classification [11][12][13][14]. This promising direction has advantages of higher penetration rate and lower cost compared to traditional methods.…”

Section: Introductionmentioning

confidence: 99%

“…This promising direction has advantages of higher penetration rate and lower cost compared to traditional methods. Studies have shown that random bright spots are generated in images recorded by CMOS image sensors under irradiation of X/γ rays [11][12][13]. Xu et al studied the potential of CMOS image sensors and found that both the mean pixel value and the cumulative pixel value have a linear relationship with radiation dose rate [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of ionizing radiation and heart rate using a smartphone camera

et al. 2020

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Complementary metal oxide semiconductor (CMOS) cameras have been used to detect ionizing radiation when shaded from light or under the condition of static scenes. We propose a novel idea for simultaneous measurement of ionizing radiation and heart rate (HR) by using a smartphone with its CMOS camera lens covered by a finger in one measurement. Verified experiments were conducted: videos were recorded using a Xiaomi8 smartphone when the camera lens was covered by a finger and a light-tight tape for controlled experiment, with a ∼33 mCi 99mTc liquid radioactive source at six different distances (from 20 to 70 cm, step size 10 cm) from the camera. The exact HRs were measured using an oximeter at the same time. Image processing algorithm is proposed to extract radiation events and HR in the same videos. Results show that: (1) frame numbers containing radiation-related bright spots in two experiments have a linear relationship, and they are inversely proportional to the square of the distance between the camera and radiation source; (2) the HR difference between the video processing and the oximeter result is less than 2 beats per minute. In conclusion, it verifies that the proposed method is available to detect ionizing radiation and measure HR simultaneously with smartphone camera lens covered by a finger. We have been working on the development of an Android phone application based on the algorithms.

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Spectrometry with Consumer-Quality CMOS Cameras

Scheeline¹

2014

Methods in Molecular Biology

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Many modern spectrometric instruments use diode arrays, charge-coupled arrays, or CMOS cameras for detection and measurement. As portable or point-of-use instruments are desirable, one would expect that instruments using the cameras in cellular telephones and tablet computers would be the basis of numerous instruments. However, no mass market for such devices has yet developed. The difficulties in using megapixel CMOS cameras for scientific measurements are discussed, and promising avenues for instrument development reviewed. Inexpensive alternatives to use of the built-in camera are also mentioned, as the long-term question is whether it is better to overcome the constraints of CMOS cameras or to bypass them.

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X-ray imaging and spectroscopy using low cost COTS CMOS sensors

Cited by 14 publications

References 2 publications

Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment

Hard x-ray bursts observed in association with Rayleigh-Taylor instigated current disruption in a solar-relevant lab experiment

Simultaneous measurement of ionizing radiation and heart rate using a smartphone camera

Spectrometry with Consumer-Quality CMOS Cameras

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