Evaluation of a matched filter resolution recovery reconstruction algorithm for SPECT-CT imaging

O'Mahoney, Eoin; Murray, Iain

doi:10.1097/mnm.0b013e32835ce5b5

Cited by 15 publications

(8 citation statements)

References 14 publications

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“…O’Mahoney et al evaluated a specific OSEM RR (Astonish) modality designed for the Philips SPECT/CT for the conventional OSEM reconstruction algorithm (12) . This study was conducted with a Jaszczak phantom.…”

Section: Discussionmentioning

confidence: 99%

Impact of Reduced Acquisition Time on Bone Single-photon Emission Computed Tomography Images in Oncology Patients

Salkica¹,

Begić²,

Vegar-Zubović³

et al. 2022

Acta Inform Med

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Background: The use of resolution recovery (RR) in bone and myocardial perfusion imaging is becoming increasingly popular in nuclear medicine departments. RR produces reconstructed images that show improved spatial resolution and signal-to-noise ratio compared with conventional single-photon emission computed tomography (SPECT) images. Objective: To evaluate the impact of the ordered subset expectation maximization (OSEM) RR modality on preserving noise, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) for short SPECT acquisition. Methods: This prospective study was conducted on 80 patients. Full SPECT acquisition was performed as a standardized protocol, while reduced acquisition was achieved with the Poisson resampling method. Noise, SNR, and CNR were measured for different reconstruction parameters for the same image levels. The impact of surface area and body mass index was also measured for the same reconstruction parameters. Results: The results show significantly higher SNR and CNR for the Evolution for Bone protocol compared to the other two reconstruction protocols for full and reduced SPECT acquisition. With the shortening of the SPECT acquisition, an increase in the value of noise was recorded. SNR and CNR decreased with the reduction in SPECT acquisition. Conclusion: The Evolution for Bone protocol for all three analyzed acquisition protocols had the lowest noise values. The highest SNR and CNR were recorded in the Evolution for Bone protocol for the three acquisition protocols and SPECT acquisition time can be reduced from 20 to 10 min for bone SPECT.

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Section: Discussionmentioning

confidence: 99%

Impact of Reduced Acquisition Time on Bone Single-photon Emission Computed Tomography Images in Oncology Patients

Salkica¹,

Begić²,

Vegar-Zubović³

et al. 2022

Acta Inform Med

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“…This problem can be compensated by the OSEM algorithm cooperated with RR. O'Mahoney et al (24) evaluated that RR could not only signi cantly enhance spatial resolution and reduce PVE, but also suppress noise and provide better contrast. In myocardial perfusion SPECT/CT, OSEM combined with RR could correct myocardial perfusion distribution and compensate for the depth-dependent blurring (25).In our study, RR highly enhanced spatial resolution, as shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Impact of Reconstruction Parameters on Spatial Resolution and Its Comparison Between Cadmium-Zinc-Telluride SPECT/CT and Conventional SPECT/CT

Wang

Dong

Zhang

et al. 2021

Preprint

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Background: To evaluate the impact of reconstruction parameters on spatial resolution of tomographic image in SPECT/CT, and to compare spatial resolution between a new polyvalent whole-body Cadmium-Zinc-Telluride camera (CZT-SPECT/CT) and a conventional dual-head Anger camera (conventional SPECT/CT). Spatial resolution was evaluated with four line sources filled with 99mTc in tomographic images reconstructed by varying reconstruction parameters. Ordered-subset expectation maximization (OSEM) algorithm was performed with varying iterations (1-20), the number of subsets was fixed at 10. Butterworth filter, Gauss filter and no-filter were selected respectively. Computed tomography-based attenuation correction (CTAC), scatter correction (SC), resolution recovery (RR) and no-correction (NC) were adopted for image correction respectively. Filtered back projection (FBP) with Butterworth filter and CTAC was also performed in image reconstruction. Spatial resolution was expressed by full width at half-maximum (FWHM) value.Results: The impact of reconstruction parameters on spatial resolution was identical in both cameras: FWHM values decreased with the increase of iterations and converged uniformly when the number of iterations was over 4. FWHM values decreased with the increase of cutoff frequency of Butterworth filter and increased with the increase of Gauss filter. SC and RR improved spatial resolution, whereas CTAC had negligible effect on spatial resolution reconstructed by OSEM. FWHM was generally lower with OSEM reconstruction than FBP reconstruction. On the whole, under the same reconstruction conditions, CZT-SPECT/CT had a lower FWHM value than conventional SPECT/CT.Conclusions: The spatial resolution was improved with the increase of iterations. Increasing the cutoff frequency of Butterworth filter and decreasing the Gauss filter enhanced spatial resolution. The spatial resolution was better reconstructed by OSEM associated with AC, SC and RR than FBP. CZT-SPECT/CT had better spatial resolution than conventional SPECT/CT.

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“…The most widely used approach for enhancing the spatial resolution is to include the point spread function (PSF) of the imaging system in the system matrix used in the forward- and back-projection steps of the iterative reconstruction, ie, including the PSF within the reconstruction framework, also known as resolution recovery. Although resolution recovery leads to substantial improvement in activity quantification, especially in small structures, a disadvantage is the appearance of ringing artifacts in the image (O’Mahoney and Murray, 2013; Rahmim et al , 2013).…”

Section: Quantification Of Activity In Source Regions For Dosimetrymentioning

confidence: 99%

ICRU REPORT 96, Dosimetry-Guided Radiopharmaceutical Therapy

et al. 2021

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The Commission wishes to express its appreciation to the individuals involved in the preparation of this Report for the time and efforts that they devoted to this task and to express its appreciation to the organizations with which they are affiliated.All rights reserved. No part of this book may be reproduced, stored in retrieval systems or transmitted in any form by any means, electronic, electrostatic, magnetic, mechanical photocopying, recording or otherwise, without the permission in writing from the publishers.

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Evaluation of a matched filter resolution recovery reconstruction algorithm for SPECT-CT imaging

Abstract: The use of such an algorithm results in images characterized by increased spatial resolution and reduced noise. However, small sources of the order of 2-3 cm can be significantly overenhanced.

Cited by 15 publications

References 14 publications

Impact of Reduced Acquisition Time on Bone Single-photon Emission Computed Tomography Images in Oncology Patients

Impact of Reduced Acquisition Time on Bone Single-photon Emission Computed Tomography Images in Oncology Patients

Impact of Reconstruction Parameters on Spatial Resolution and Its Comparison Between Cadmium-Zinc-Telluride SPECT/CT and Conventional SPECT/CT

ICRU REPORT 96, Dosimetry-Guided Radiopharmaceutical Therapy

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Evaluation of a matched filter resolution recovery reconstruction algorithm for SPECT-CT imaging

Abstract: The use of such an algorithm results in images characterized by increased spatial resolution and reduced noise. However, small sources of the order of 2-3 cm can be significantly overenhanced.

Cited by 15 publications

References 14 publications

Impact of Reduced Acquisition Time on Bone Single-photon Emission Computed Tomography Images in Oncology Patients

Impact of Reduced Acquisition Time on Bone Single-photon Emission Computed Tomography Images in Oncology Patients

Impact of Reconstruction Parameters on Spatial Resolution and Its Comparison Between Cadmium-Zinc-Telluride&nbsp;SPECT/CT and Conventional SPECT/CT

ICRU REPORT 96, Dosimetry-Guided Radiopharmaceutical Therapy

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Impact of Reconstruction Parameters on Spatial Resolution and Its Comparison Between Cadmium-Zinc-Telluride SPECT/CT and Conventional SPECT/CT