Single photon scatter compensation by photopeak energy distribution analysis

Logan, K.W.; McFarland, William D.

doi:10.1109/42.141639

Cited by 11 publications

(6 citation statements)

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“…Numerous methods have been proposed for scatter correction [e.g. [2][3][4][5][6][7][8][9][10][11][12][13]. However, the clinical benefits of their use with respect to their potentialities deduced from phantom studies has not yet been fully investigated.…”

Section: Discussionmentioning

confidence: 99%

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A comparative study of scatter correction methods for scintigraphic images

et al. 1994

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Phantom studies have demonstrated that factor analysis of medical image sequences using target apex-seeking (FAMIS-TAS) applied to spectral scintigraphic image sequences is an efficient adaptive scatter correction method. We assessed the improvement in quality of clinical images using FAMIS-TAS as compared with two other scatter correction techniques: conventional 20% photopeak window (PW) and scatter window subtraction (SWS). Thirty normal technetium-99m hydroxymethylene diphosphonate bone scans were processed. Bone to soft tissue contrasts and signal-to-noise and contrast-to-noise ratios were measured. The overall image quality was evaluated using an observer testing questionnaire submitted to four physicians. Quantitative parameters showed that FAMIS-TAS images displayed the best bone to soft tissue contrasts and contrast-to-noise ratios, but the lowest signal-to-noise ratios. PW images presented the lowest contrasts and contrast-to-noise ratios, and the highest signal-to-noise ratios. SWS gave intermediate results. According to the observer testing results, PW images showed the lowest bone to soft tissue contrasts and the highest signal-to-noise ratios. FAMIS-TAS images showed the lowest signal-to-noise ratios. The images processed by the three methods displayed the same anatomical information.

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Section: Discussionmentioning

confidence: 99%

“…Many other methods of scatter correction have therefore been proposed [e.g. [2][3][4][5][6][7][8][9][10][11][12][13]. Most of them have been proven to improve scatter rejection and quantitation using simulated data or phantom studies, but none has been fully evaluated in clinical situations.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of scatter correction methods for scintigraphic images

et al. 1994

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“…Most of these studies are related to the imaging with the radioisotope of technetium-99m. [ 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ] There are a few studies for other radioisotopes. In this study, we intend to investigate and compare the influence of four scatter correction approximations on the quality of In-111 SPECT images.…”

Section: Introductionmentioning

confidence: 99%

Assessment of four scatter correction methods in In-111 SPECT imaging: A simulation study

Noori-Asl

2020

J Med Phys

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Introduction: Detection of compton scattered photons is one of the most important factors affecting the quality of single-photon emission computed tomography (SPECT) images. In most cases, the multiple-energy window acquisition methods are used for estimation of the scatter contribution into the main energy window(s) used in imaging. Aims and Objectives: The purpose of this study is to evaluate and compare the performance of four different scatter correction methods in In-111 SPECT imaging. Due to the lack of sufficient studies in this field, it can be useful to perform a more detailed and comparative study. Materials and Methods: Four approximations for scatter correction of In-111 SPECT images are evaluated by using the Monte Carlo simulation. These methods are firstly applied on each of photopeak windows, separately. Then, the effect of the correction methods is investigated by considering both the photopeak windows. The images obtained from a simulated multiple-spheres phantom are used for the evaluation of the correction methods by using three assessment criteria, including the image contrast, relative noise, and the recovery coefficient. Results: The results of this study show that the correction methods, when using the single photopeak windows, result in increase in image contrast with a significant level of noise. In return, when both the photopeak energy windows are used for imaging, it is possible to achieve the better image characteristics. Conclusion: The use of the proposed correction methods, by considering both the photopeak windows, leads to improve the image contrast with a reasonable level of image noise.

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“…In this method,[ 6 ] it is assumed that the photopeak energy window can be divided into two subwindows such that for each of the projection image pixels, the number of scatter events included within these two subwindows are approximately equal, that is:…”

Section: Methodsmentioning

confidence: 99%

“…Many methods for scatter correction of SPECT images have been proposed by several investigators. [ 4 5 6 7 8 9 10 11 12 ] Some of them are based on a spectral analysis that is performed by setting additional energy windows in 99m Tc spectrum, and others rely on a spatial analysis that is implemented by convolution and deconvolution procedures. In this study, six scatter correction methods from the first category are individually evaluated.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of six scatter correction methods based on spectral analysis in ^99m Tc SPECT imaging using SIMIND Monte Carlo simulation

2013

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Compton-scattered photons included within the photopeak pulse-height window result in the degradation of SPECT images both qualitatively and quantitatively. The purpose of this study is to evaluate and compare six scatter correction methods based on setting the energy windows in 99mTc spectrum. SIMIND Monte Carlo simulation is used to generate the projection images from a cold-sphere hot-background phantom. For evaluation of different scatter correction methods, three assessment criteria including image contrast, signal-to-noise ratio (SNR) and relative noise of the background (RNB) are considered. Except for the dual-photopeak window (DPW) method, the image contrast of the five cold spheres is improved in the range of 2.7-26%. Among methods considered, two methods show a nonuniform correction performance. The RNB for all of the scatter correction methods is ranged from minimum 0.03 for DPW method to maximum 0.0727 for the three energy window (TEW) method using trapezoidal approximation. The TEW method using triangular approximation because of ease of implementation, good improvement of the image contrast and the SNR for the five cold spheres, and the low noise level is proposed as most appropriate correction method.

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Single photon scatter compensation by photopeak energy distribution analysis

Cited by 11 publications

References 1 publication

A comparative study of scatter correction methods for scintigraphic images

A comparative study of scatter correction methods for scintigraphic images

Assessment of four scatter correction methods in In-111 SPECT imaging: A simulation study

Evaluation of six scatter correction methods based on spectral analysis in ^99m Tc SPECT imaging using SIMIND Monte Carlo simulation

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Single photon scatter compensation by photopeak energy distribution analysis

Cited by 11 publications

References 1 publication

A comparative study of scatter correction methods for scintigraphic images

A comparative study of scatter correction methods for scintigraphic images

Assessment of four scatter correction methods in In-111 SPECT imaging: A simulation study

Evaluation of six scatter correction methods based on spectral analysis in 99m Tc SPECT imaging using SIMIND Monte Carlo simulation

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Evaluation of six scatter correction methods based on spectral analysis in ^99m Tc SPECT imaging using SIMIND Monte Carlo simulation