Analytical model for SPECT detector concepts

Wieczorek, H.; Goedicke, Andreas

doi:10.1109/tns.2006.874954

Cited by 37 publications

(27 citation statements)

References 15 publications

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“…All the aforementioned types of collimation however suffer from the same trade-off between sensitivity, spatial resolution and FOV. For a discussion on the most common SPECT collimators with respect to these three criteria, the reader is referred to the excellent overview papers by Wieczorek (Wieczorek and Goedicke 2006), Accorsi (Accorsi 2006) and Moore (Moore et al 1992). Rotating slat (RS) collimators (figure 1), which are the subject of this paper, break with the traditional collimators described above.…”

Section: Introductionmentioning

confidence: 99%

Tomographic image quality of rotating slat versus parallel hole-collimated SPECT

2011

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Abstract. Parallel and converging hole collimators are most frequently used in nuclear medicine. Less common is the use of rotating slat collimators for Single Photon Emission Computed Tomography (SPECT). The higher photon collection efficiency, inherent to the geometry of rotating slat collimators results in much lower noise in the data. However, plane integrals contain spatial information in only one direction, whereas line integrals provide two-dimensional information. It is not a trivial question whether the initial gain in efficiency will compensate for the lower information content in the plane integrals. Therefore, a comparison of the performance of parallel hole and rotating slat collimation is needed. This study compares SPECT with rotating slat and parallel hole collimation in combination with MLEM reconstruction with accurate system modeling and correction for scatter and attenuation. A contrast-to-noise study revealed an improvement of a factor 2 to 3 for hot lesions and more than a factor of 4 for cold lesion. Furthermore, a clinically relevant case of heart lesion detection is simulated for rotating slat and parallel hole collimators. In this case, rotating slat collimators outperform the traditional parallel hole collimators. We conclude that rotating slat collimators are a valuable alternative for parallel hole collimators.

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Section: Introductionmentioning

confidence: 99%

Tomographic image quality of rotating slat versus parallel hole-collimated SPECT

2011

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“…The pixel size of the PID 350 CdTe PSD was 0.35 × 0.35 mm 2 , with an array of 128 × 128 pixels. The detector thickness was 1 mm, and the physical gap was 1 pixel.…”

Section: Pid 350 Cdte Psdmentioning

confidence: 99%

“…In a parallel-hole collimator system, the efficiency ε -hole and resolution R-hole of the collimator were defined as follows [2,8]:…”

Section: Pinhole and Three Parallel-hole Collimatorsmentioning

confidence: 99%

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A Numerical Study of Different Types of Collimators for a High-Resolution Preclinical CdTe Pixelated Semiconductor SPECT System

Jeong

Kim

Bae

et al. 2016

Journal of the Optical Society of Korea

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In single-photon-emission computed tomography (SPECT) with a pixelated semiconductor detector (PSD), not only pinhole collimators but also parallel-hole collimators are often used in preclinical nuclear-medicine imaging systems. The purpose of this study was to evaluate and compare pinhole and parallel-hole collimators in a PSD. For that purpose, we paired a PID 350 (Ajat Oy Ltd., Finland) CdTe PSD with each of the four collimators most frequently used in preclinical nuclear medicine: (1) a pinhole collimator, and (2) low-energy high-resolution (LEHR), (3) low-energy general-purpose (LEGP), and (4) low-energy high-sensitivity (LEHS) parallel-hole collimators. The sensitivity and spatial resolution of each collimator was evaluated using a point source and a hot-rod phantom. The highest sensitivity was achieved using LEHS, followed by LEGP, LEHR, and pinhole. Also, at a source-to-collimator distance of 2 cm, the spatial resolution was 1.63, 2.05, 2.79, and 3.45 mm using pinhole, LEHR, LEGP, and LEHS, respectively. The reconstructed hot-rod phantom images showed that the pinhole collimator and the LEHR parallel-hole collimator give a fine spatial resolution for preclinical SPECT with PSD. In conclusion, we successfully compared different types of collimators for a preclinical pixelated semiconductor SPECT system.

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“…The geometric efficiency of a fan beam collimator with square holes, hole diameter (parallel-to-parallel side distance) d, septal thickness t, detector pixel pitch p=d+t, collimator thickness Lo, source-collimator distance zo, source-detector Zo '=zo+Lo, hole incidence angle fJ and focal distance fx (assuming focusing in x-direction), is described by the equation [6] dd dd 1,…”

Section: A Collimator Theorymentioning

confidence: 99%

Optimal design of fan beam collimation for pixelated breast imaging systems

Capote

Almeida

2011

2011 IEEE Nuclear Science Symposium Conference Record

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In SPECT the collimator optimization is crucial to obtain a maximized sensitivity for a fixed resolution. In this work we present one approach to optimize convergent collimators for pix elated imaging systems.An optimization algorithm was developed and used to optimize a matched fan beam collimator to image the entire breast and chest wall region. The range of input parameters used to calculate the optimal collimator dimensions was defined using data from patient studies for dual-head scintimammography systems.Results showed that the optimal fan beam collimator thickness is approximately constant from the center to the edge, as well the hole diameter and the septal thickness in both directions.Designed optimal collimators for pixelated breast imaging systems have an increased sensitivity for the upper holes, allowing a good detection in the chest wall region.

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Analytical model for SPECT detector concepts

Cited by 37 publications

References 15 publications

Tomographic image quality of rotating slat versus parallel hole-collimated SPECT

Tomographic image quality of rotating slat versus parallel hole-collimated SPECT

A Numerical Study of Different Types of Collimators for a High-Resolution Preclinical CdTe Pixelated Semiconductor SPECT System

Optimal design of fan beam collimation for pixelated breast imaging systems

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