<?xml version="1.0" encoding="utf-8"?>
			<journal>
			<title>Asia Oceania Journal of Nuclear Medicine and Biology</title>
			<title_fa></title_fa>
			<short_title>AOJNMB</short_title>
			<subject>Medical Sciences</subject>
			<web_url>https://aojnmb.mums.ac.ir/</web_url>
			<journal_hbi_system_id>0</journal_hbi_system_id>
			<journal_hbi_system_user></journal_hbi_system_user>
			<journal_id_issn>2322-5718</journal_id_issn>
			<journal_id_issn_online>2322-5726</journal_id_issn_online>
			<journal_id_pii></journal_id_pii>
			<journal_id_doi></journal_id_doi>
			<journal_id_iranmedex></journal_id_iranmedex>
			<journal_id_magiran></journal_id_magiran>
			<journal_id_sid></journal_id_sid>
			<journal_id_nlai></journal_id_nlai>
			<journal_id_science></journal_id_science>
			<language>en</language>
			<pubdate>
				<type>jalali</type>
				<year>0</year>
				<month>0</month>
				<day>1</day>
			</pubdate>
			<pubdate>
				<type>gregorian</type>
				<year>2017</year>
				<month>7</month>
				<day>1</day>
			</pubdate>
			<volume>5</volume>
			<number>2</number>
			<publish_type>online</publish_type>
			<publish_edition>1</publish_edition>
			<article_type>fulltext</article_type>
			<articleset><article>
				<language>en</language>
				<article_id_issn></article_id_issn>
				<article_id_issn_online></article_id_issn_online>
				<article_id_pubmed></article_id_pubmed>
				<article_id_pii></article_id_pii>
				<article_id_doi></article_id_doi>
				<article_id_iranmedex></article_id_iranmedex>
				<article_id_magiran></article_id_magiran>
				<article_id_sid></article_id_sid>
				<title_fa></title_fa>
				<title>Edge Artifacts in Point Spread Function-based PET Reconstruction in Relation to Object Size and Reconstruction Parameters</title>
				<subject_fa></subject_fa>
				<subject></subject>
				<content_type_fa></content_type_fa>
				<content_type>Original Article</content_type>
				<abstract_fa><![CDATA[]]></abstract_fa>
				<abstract><![CDATA[Objective(s): We evaluated edge artifacts in relation to phantom diameter and reconstruction parameters in point spread function (PSF)-based positron emission tomography (PET) image reconstruction.Methods: PET data were acquired from an original cone-shaped phantom filled with 18F solution (21.9 kBq/mL) for 10 min using a Biograph mCT scanner. The images were reconstructed using the baseline ordered subsets expectation maximization (OSEM) algorithm and the OSEM with PSF correction model. The reconstruction parameters included a pixel size of 1.0, 2.0, or 3.0 mm, 1-12 iterations, 24 subsets, and a full width at half maximum (FWHM) of the post-filter Gaussian filter of 1.0, 2.0, or 3.0 mm. We compared both the maximum recovery coefficient (RCmax) and the mean recovery coefficient (RCmean) in the phantom at different diameters.Results: The OSEM images had no edge artifacts, but the OSEM with PSF images had a dense edge delineating the hot phantom at diameters 10 mm or more and a dense spot at the center at diameters of 8 mm or less. The dense edge was clearly observed on images with a small pixel size, a Gaussian filter with a small FWHM, and a high number of iterations. At a phantom diameter of 6-7 mm, the RCmax for the OSEM and OSEM with PSF images was 60% and 140%, respectively (pixel size: 1.0 mm; FWHM of the Gaussian filter: 2.0 mm; iterations: 2). The RCmean of the OSEM with PSF images did not exceed 100%.Conclusion: PSF-based image reconstruction resulted in edge artifacts, the degree of which depends on the pixel size, number of iterations, FWHM of the Gaussian filter, and object size.]]></abstract>
				<keyword_fa></keyword_fa>
				<keyword>edge artifact, point-spread function, PET</keyword>
				<start_page>141</start_page>
				<end_page>151</end_page>
				<web_url>https://aojnmb.mums.ac.ir/article_8802.html</web_url>
			<author_list><author>
				<first_name>Yuji</first_name>
				<middle_name></middle_name>
				<last_name>Tsutsui</last_name>
				<suffix></suffix>
				<first_name_fa></first_name_fa>
				<middle_name_fa></middle_name_fa>
				<last_name_fa></last_name_fa>
				<suffix_fa></suffix_fa>
				<email>yuji1006@med.kyushu-u.ac.jp</email>
				<code>36099</code>
				<coreauthor>Yes</coreauthor>
				<affiliation>Division of Radiology, Department of Medical Technology, Kyushu University Hospital, Fukuoka, Japan</affiliation>
				<affiliation_fa></affiliation_fa>
				 </author><author>
				<first_name>Shinichi</first_name>
				<middle_name></middle_name>
				<last_name>Awamoto</last_name>
				<suffix></suffix>
				<first_name_fa></first_name_fa>
				<middle_name_fa></middle_name_fa>
				<last_name_fa></last_name_fa>
				<suffix_fa></suffix_fa>
				<email></email>
				<code>36183</code>
				<coreauthor>No</coreauthor>
				<affiliation>Division of Radiology, Department of Medical Technology, Kyushu University Hospital, Fukuoka, Japan</affiliation>
				<affiliation_fa></affiliation_fa>
				 </author><author>
				<first_name>Kazuhiko</first_name>
				<middle_name></middle_name>
				<last_name>Himuro</last_name>
				<suffix></suffix>
				<first_name_fa></first_name_fa>
				<middle_name_fa></middle_name_fa>
				<last_name_fa></last_name_fa>
				<suffix_fa></suffix_fa>
				<email>himuro@med.kyushu-u.ac.jp</email>
				<code>36184</code>
				<coreauthor>No</coreauthor>
				<affiliation>Division of Radiology, Department of Medical Technology, Kyushu University Hospital, Fukuoka, Japan</affiliation>
				<affiliation_fa></affiliation_fa>
				 </author><author>
				<first_name>Yoshiyuki</first_name>
				<middle_name></middle_name>
				<last_name>Umezu</last_name>
				<suffix></suffix>
				<first_name_fa></first_name_fa>
				<middle_name_fa></middle_name_fa>
				<last_name_fa></last_name_fa>
				<suffix_fa></suffix_fa>
				<email></email>
				<code>36185</code>
				<coreauthor>No</coreauthor>
				<affiliation>Division of Radiology, Department of Medical Technology, Kyushu University Hospital, Fukuoka, Japan</affiliation>
				<affiliation_fa></affiliation_fa>
				 </author><author>
				<first_name>Shingo</first_name>
				<middle_name></middle_name>
				<last_name>Baba</last_name>
				<suffix></suffix>
				<first_name_fa></first_name_fa>
				<middle_name_fa></middle_name_fa>
				<last_name_fa></last_name_fa>
				<suffix_fa></suffix_fa>
				<email>sbaba127@radiol.med.kyushu-u.ac.jp</email>
				<code>36186</code>
				<coreauthor>No</coreauthor>
				<affiliation>Department of Clinical Radiology, Kyushu University Hospital, Fukuoka, Japan</affiliation>
				<affiliation_fa></affiliation_fa>
				 </author><author>
				<first_name>Masayuki</first_name>
				<middle_name></middle_name>
				<last_name>Sasaki</last_name>
				<suffix></suffix>
				<first_name_fa></first_name_fa>
				<middle_name_fa></middle_name_fa>
				<last_name_fa></last_name_fa>
				<suffix_fa></suffix_fa>
				<email>msasaki@hs.med.kyushu-u.ac.jp</email>
				<code>36187</code>
				<coreauthor>No</coreauthor>
				<affiliation>Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan</affiliation>
				<affiliation_fa></affiliation_fa>
				 </author></author_list>
				</article>
			</articleset>
			</journal>