CdTe detectors in medicine: a review of current applications and future perspectives

Scheiber, C.; Chambron, J.

doi:10.1016/0168-9002(92)91239-6

Cited by 30 publications

(6 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several projects are under way to develop compact mobile gamma cameras with CdTe or CdZnTe detectors. [10][11][12][13][14] In contrast to most of the existing literature, the present work focuses on the potentiality of CdTe as an x-ray detector under the high quantum flux used for medical diagnosis, e.g., in computed tomography ͑CT͒. The detector is then unable to distinguish and count single quanta.…”

Section: Introductionmentioning

confidence: 99%

Signal formation and decay in CdTe x‐ray detectors under intense irradiation

Jahnke

Matz

1999

Medical Physics

View full text Add to dashboard Cite

The response of Cd(Zn)Te Schottky and resistive detectors to intense x-rays is investigated in a commercial computed tomography (CT) system to assess their potential for medical diagnostics. To describe their signal height, responsivity, signal-to-noise ratio (SNR), and detective quantum efficiency the devices are modeled as solid-state ionization chambers with spatially varying electric field and charge collection efficiency. The thicknesses and pixel areas of the discrete detector elements are 0.5-2 mm and a few mm2, respectively. The incident spectrum extends from 26 to 120 keV and comprises 10(10) quanta/s cm2. It photogenerates a carrier concentration in the semiconductor that is two to three orders of magnitude above the intrinsic concentration, but remains to a similar extent below the charge densities on the device electrodes. Stable linear operation is achieved with the Schottky-type devices under high bias. Their behavior can be modeled well if negatively charged near-midgap bulk defects with a concentration of 10(11)-10(13) cm-3 are assumed. The bulk defects explain the amount and time constant (about 100 ms) of the detrapping current measured after x-ray pulses (afterglow). To avoid screening by the trapped space charge the bias voltage should exceed 100(V) x [detector thickness/mm]2. Dark currents are of the order of the generation-recombination current, i.e., 300 pA/mm3 detector volume. With proper device design the signal height approaches the theoretical maximum of 0.2 A/W. This high responsivity, however, is not exploited in CT since the SNR is determined here by the incident quantum noise. As a consequence of the detrapping current, the response speed does not meet CT requirements. A medium-term effort for crystal growth appears necessary to achieve the required reduction of the trap density by an order of magnitude. Scintillation based detectors are, therefore, still preferred in fast operating medical diagnostic systems.

show abstract

Section: Introductionmentioning

confidence: 99%

Signal formation and decay in CdTe x‐ray detectors under intense irradiation

Jahnke

Matz

1999

Medical Physics

View full text Add to dashboard Cite

show abstract

“…In nuclear imaging, depending on the type of diagnosis, it is necessary to image the isotopes of radioactive tracers, such as 99m Tc, 123 I, 18 F, 111 In, 201 Tl and so on, which possess different half-lives and energies. Some of the popular RI tracers used in nuclear medicine are listed in Table 4 , along with their half-lives, decay type, and the energy of their γ-rays [ 52 ]. A Compton camera should possess the ability to image tracers with a high efficiency and sensitivity.…”

Section: Applications Of Compton Camerasmentioning

confidence: 99%

“…Very few review papers on Compton cameras exist in the literature; those that have been published only cover specific topics (e.g., the detectors used in Compton cameras or their specific uses [ 52 , 53 , 54 , 55 ]). Moreover, there is a lack of current review papers on Compton cameras and their applications.…”

Section: Introductionmentioning

confidence: 99%

Development and Applications of Compton Camera—A Review

Parajuli

Sakai

Parajuli³

et al. 2022

Sensors

View full text Add to dashboard Cite

The history of Compton cameras began with the detection of radiation sources originally for applications in astronomy. A Compton camera is a promising γ-ray detector that operates in the wide energy range of a few tens of keV to MeV. The γ-ray detection method of a Compton camera is based on Compton scattering kinematics, which is used to determine the direction and energy of the γ-rays without using a mechanical collimator. Although the Compton camera was originally designed for astrophysical applications, it was later applied in medical imaging as well. Moreover, its application in environmental radiation measurements is also under study. Although a few review papers regarding Compton cameras have been published, they either focus very specifically on the detectors used in such cameras or the particular applications of Compton cameras. Thus, the aim of this paper is to review the features and types of Compton cameras and introduce their applications, associated imaging algorithms, improvement scopes, and their future aspects.

show abstract

“…Over the past decades, researchers have been dedicated to developing gamma-cameras with improved spatial resolution and energy resolution. Semiconductor nuclear radiation detectors, especially cadmium zinc telluride (Cd 1−x Zn x Te, CZT) materials, have been considered as alternatives to scintillator detectors [ 3 , 4 , 5 ] because of their good stopping power and low dark current [ 4 , 6 , 7 ]. Notably, the major advantage of semiconductor over traditional scintillator detectors is that they can directly convert the deposited photon energy into measurable signals, which could improve energy resolution and detection efficiency [ 4 , 5 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Wobbling Method Applied to Correcting Defective Pixels of CZT Detectors in SPECT Imaging

Xie

Yang

et al. 2016

Sensors

View full text Add to dashboard Cite

In this paper, we propose a wobbling method to correct bad pixels in cadmium zinc telluride (CZT) detectors, using information of related images. We build up an automated device that realizes the wobbling correction for small animal Single Photon Emission Computed Tomography (SPECT) imaging. The wobbling correction method is applied to various constellations of defective pixels. The corrected images are compared with the results of conventional interpolation method, and the correction effectiveness is evaluated quantitatively using the factor of peak signal-to-noise ratio (PSNR) and structural similarity (SSIM). In summary, the proposed wobbling method, equipped with the automatic mechanical system, provides a better image quality for correcting defective pixels, which could be used for all pixelated detectors for molecular imaging.

show abstract

CdTe detectors in medicine: a review of current applications and future perspectives

Cited by 30 publications

References 39 publications

Signal formation and decay in CdTe x‐ray detectors under intense irradiation

Signal formation and decay in CdTe x‐ray detectors under intense irradiation

Development and Applications of Compton Camera—A Review

Evaluation of a Wobbling Method Applied to Correcting Defective Pixels of CZT Detectors in SPECT Imaging

Contact Info

Product

Resources

About