Abstract:
:Filtered back projection (FBP) method, maximum likelihood-expectation maximization(ML-EM) method, and ordered subsets-expectation maximization (OS-EM) method are currently used for reconstruction of SPECT images in clinical studies. In the ML-EM method, images of good quality can be reconstructed even with a small sampling number of projection data, when compared with FBP. Shorter acquisition time and less radionuclide dose are preferable in the clinical setting if image quality is the same. In this study, we attempted to find optimal conditions for reconstruction of OS-EM images with commonly used sampling numbers of 30, 60 and 120 (step angles: 12 degrees, 6 degrees, and 3 degrees, respectively), with acquisition counts/projection of 30, 60, 120 and 240 each. We adjusted the pixel counts of reconstructed images to be constant, by setting combination of sampling number and counts/projection (120 sampling number for 30 counts/projection, 60 for 60, and 30 for 120). Among the 3 acquisition conditions, the small sampling number of 30 had large acquisition counts per direction, resulting in low signal to noise ratio. Under this condition, the resolution was slightly low, but the uniformity of images was high. The combination of OS-EM and smaller sampling projection number may be clinically useful with reduction of the examination time, which is also beneficial to reduce dead time for gamma-camera rotation.
journal_name
Ann Nucl Medjournal_title
Annals of nuclear medicineauthors
Takahashi Y,Murase K,Mochizuki T,Higashino H,Sugawara Y,Kinda Adoi
10.1007/BF03006664subject
Has Abstractpub_date
2003-10-01 00:00:00pages
525-30issue
7eissn
0914-7187issn
1864-6433journal_volume
17pub_type
杂志文章abstract::Metastatic tumors or secondary lymphoma of the kidney are rare and can often be missed on conventional computed tomography (CT) imaging. On the other hand, many types of metastatic tumor or lymphoma can be detected clearly as hotspots of elevated uptake on FDG PET. However, excreted FDG present in the urinary tract mi...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章,评审
doi:10.1007/BF02985596
更新日期:2006-01-01 00:00:00
abstract:OBJECTIVES:To compare L-3-[18F]-fluoro-a-methyltyrosine (FMT)-positron emission tomography (PET) and 2-[18F]-fluoro-2-deoxy-D-glucose (FDG)-PET in the differential diagnosis of maxillofacial tumors. METHODS:This study included 36 patients (16 males, 20 females; 31-90 years old) with untreated malignant tumors (34 squa...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03033991
更新日期:2007-02-01 00:00:00
abstract:AIM:To investigate the diagnostic performance of early acquisition compared to late imaging for the detection of local recurrence of prostate cancer by means of ¹⁸F-FCH PET/CT. MATERIALS AND METHODS:99 patients with radical prostatectomy (mean PSA 3.9 ± 5.03) were subjected to early dynamic PET/CT acquisition of the p...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-015-1015-1
更新日期:2015-12-01 00:00:00
abstract:OBJECTIVE:The tumor-to-normal tissue (T/N) boron ratio is determined in a patient prior to boron neutron capture therapy (BNCT) using 4-borono-2-18F-fluoro-L-phenylalanine (18F-FBPA) positron emission tomography (PET). The T/N ratio is used as a reference parameter to calculate BNCT dose and to evaluate treatment effec...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-019-01415-z
更新日期:2020-01-01 00:00:00
abstract::Scintigraphy with 99mTc-diethylenetriaminepentaacetate with galactosyl human serum albumin (99mTc-GSA) and per-rectal portal scintigraphy are useful for evaluating hepatic functional reserve and portal circulation, respectively. We did the procedures simultaneously in some patients to examine the relationship between ...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164899
更新日期:1999-08-01 00:00:00
abstract:OBJECTIVE:Epidermal growth factor receptor tyrosine kinase (EGFR-TK) represents an attractive target for tumor diagnosis agents. Previously, radioiodinated 4-(3-iodophenoxy)-6,7-diethoxyquinazoline (PHY) was reported to possess good characteristics as a tumor imaging agent. We have explored the feasibility of developin...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-013-0703-y
更新日期:2013-06-01 00:00:00
abstract::Technetium-99m tetrofosmin and thallium-201 lung SPECT imaging were performed in a patient with adenocarcinoma of the lung. Significant activities in the lung lesion were clearly depicted on both technetium-99m tetrofosmin and thallium-201 SPECT imaging. The early uptake, delayed uptake ratios and retention indices of...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03165069
更新日期:1996-02-01 00:00:00
abstract:OBJECTIVE:Radio-guided sentinel node (SN) biopsy is a standard method used in the treatment of early breast cancer. Single photon emission computed tomography with computed tomography (SPECT/CT) has been commonly used for SN detection. SPECT/CT adds precise anatomical information of SN sites, and it is reported that mo...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-018-1319-z
更新日期:2019-03-01 00:00:00
abstract::We report FDG PET of two cases of cold abscess due to Mycobacterium tuberculosis. Case 1 had colon cancer; FDG PET showed high FDG uptake in the colon lesion and low uptake in the inguinal lesion. The latter was a tuberculous cold abscess confirmed by CT/MRI and biopsy. Case 2 received radiotherapy for lung cancer and...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF02985581
更新日期:2005-09-01 00:00:00
abstract::F-18 fluorodeoxyglucose positron emission tomography (FDG-PET) imaging is a useful modality in the detection of various tumors, including colon cancer and gastric cancer. We evaluated a patient with duodenal cancer with multiple metastases including brain metastases using FDG-PET imaging. It revealed multiple tumor up...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF02984475
更新日期:2004-06-01 00:00:00
abstract:OBJECTIVE:Pre-clinical studies with gallium-68 zoledronate ([68Ga]Ga-DOTAZOL) have proposed it to be a potent bisphosphonate for PET/CT diagnosis of bone diseases and diagnostic counterpart to [177Lu]Lu-DOTAZOL and [225Ac]Ac-DOTAZOL. This study aims to be the first human biodistribution and dosimetric analysis of [68Ga...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-019-01348-7
更新日期:2019-06-01 00:00:00
abstract::Pyothorax-associated lymphoma (PAL) is a non-Hodgkin's lymphoma developing in the pleural cavity after a long-standing history of chronic pyothorax (CP). F-18 fluorodeoxyglucose positron emission tomography (FDG-PET) imaging is a useful modality for determination of disease extent of various malignant tumors, includin...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF02985123
更新日期:2005-12-01 00:00:00
abstract::The biodistribution and imaging characteristics of the 111In-labeled anti CEA monoclonal antibody ZCE-025 were studied in five patients with suspicion of colorectal carcinoma. Evaluation included antibody pharmacokinetics and assessment of antibody distribution in surgical specimen, making a comparison with whole-body...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164638
更新日期:1992-02-01 00:00:00
abstract::To evaluate two methods for decreasing and/or diluting the FDG activity in the urinary system, five rats were intraperitoneally given 1,000 micrograms/g of L-lysine 4 times, starting from 60 minutes before iv injection of FDG, and then at 30-minute intervals for 90 minutes. Five rats were used as controls. In a furose...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164766
更新日期:1997-08-01 00:00:00
abstract:OBJECTIVE:To demonstrate the effect of clinicopathological factors on 68Ga-PSMA-11 PET/CT positivity at the time of biochemical recurrence (BCR) of localized prostate cancer (PCa) following definitive therapy. METHODS:We retrospectively reviewed our institutional database for PCa patients who had BCR and subsequently ...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-019-01340-1
更新日期:2019-05-01 00:00:00
abstract::16alpha-[(18)F]Fluoro-17beta-estradiol (FES) is an estrogen receptor (ER) ligand used for the detection of ER-positive malignant tumors such as breast cancer. We recently reported the feasibility of combined FES-and 2-[(18)F]fluoro-2-deoxy-D-glucose (FDG)-positron emission tomography (PET) scans for the differential d...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-007-0075-2
更新日期:2008-01-01 00:00:00
abstract::A rare case of inferior vena cava (IVC) thrombosis and pulmonary embolism secondary to acute exacerbation of chronic pancreatitis was reported. Radionuclide venography and lung perfusion scintigraphy were performed on a 46-year-old male with acute exacerbation of chronic pancreatitis who complained of mild swelling of...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF02993720
更新日期:2002-04-01 00:00:00
abstract::123I-BMIPP (beta-methyl-iodophenyl pentadecanoic acid) has shown unique properties for potential use in assessing myocardial metabolism. Previous basic and clinical studies demonstrated that the disturbances of myocardial metabolism precede the occurrence of myocardial perfusion abnormalities by using 201Tl in hypertr...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03165056
更新日期:1996-02-01 00:00:00
abstract::To systematically review published data on the role of positron emission tomography (PET) or PET/computed tomography (PET/CT) using either Carbon-11 ((11)C) or Fluorine-18 ((18)F) choline tracer in tumors other than prostatic cancer. A comprehensive literature search of studies published in PubMed/MEDLINE and Embase d...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章,评审
doi:10.1007/s12149-012-0602-7
更新日期:2012-07-01 00:00:00
abstract::Using the fuzzy set theory, a method was developed for analyzing the extent and severity of ischemia by comparing the exercise and delayed SPECT images with Thallium-201. For each short axial image (slice) for exercise and delayed study, a defect probability matrix (DPM) is created so that it shows the severity of isc...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164947
更新日期:1988-11-01 00:00:00
abstract:OBJECTIVE:To determine the optimal accumulation time for three-dimensional positron emission tomography (3D-PET) with (18)F-2-fluoro-2-deoxy-D-glucose ((18)F-FDG) to detect the brain uptake pattern typical of Alzheimer's disease (AD). METHODS:Patients with mild AD or amnestic mild cognitive impairment (MCI) and normal...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章,多中心研究
doi:10.1007/s12149-013-0704-x
更新日期:2013-06-01 00:00:00
abstract:OBJECTIVE:To design, build, and evaluate an animal PET scanner, which can be used with non-human primates under conscious condition, incorporating flat-panel position-sensitive photomultiplier tubes (PS-PMTs). METHODS:The system contains 30 detector modules, each having two PS-PMTs and 16×18 lutetium–yttrium oxyortho-...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-013-0772-y
更新日期:2014-01-01 00:00:00
abstract::Since cerebrospinal fluid (CSF) leakage is highlighted as a cause of persistent headache, radionuclide cisternography has been increasingly performed in Japan to confirm the disorder, although the limited ability of the examination should be recognized. We present 3 cases in which failure of a tracer injection was str...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF02984653
更新日期:2006-05-01 00:00:00
abstract::Bacterial orbital cellulitis is an infection of the soft tissues behind the orbital septum. Cellulitis is seen as a poorly defined area of increased CT density or T2 signal intensity within the fat. There is an amorphous enhancement following contrast infusion. Radiolabeled leukocytes or granulocytes are now establish...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03012129
更新日期:2001-02-01 00:00:00
abstract:OBJECTIVE:(11)C-Methionine positron emission tomography (MET-PET) has been used to distinguish brain tumor recurrence from radiation necrosis. Because the spatial resolution of conventional PET scanners is low, partial volume effect (PVE) may decrease the detectability of small tumor recurrence. The aim of this study i...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-010-0450-2
更新日期:2011-04-01 00:00:00
abstract::We recently experienced a case with uveitis suffering from fever of unknown origin suspected of being caused by sarcoidosis. Chest computed tomography showed right supraclavicular, bilateral mediastinal, and right hilar lymphadenopathy, and intensive abnormal uptake of 2-[18F]fluoro-2-deoxy-D-glucose (18F-FDG) was obs...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-007-0037-8
更新日期:2007-08-01 00:00:00
abstract:OBJECTIVE:To investigate the correlation between the F-18 FDG uptake in the normal testis as assessed by PET-CT and patient age in a pediatric study population. METHODS:The study population consisted of 22 subjects aged between 9 and 17 years. For these subjects 42 PET-CT scans were available for analysis. The testis ...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-009-0308-7
更新日期:2009-11-01 00:00:00
abstract::Tuberculosis peritonitis is a rare manifestation of extrapulmonary tuberculosis. The results of gallium-67 scintigraphy of three patients with tuberculosis peritonitis were reviewed to assess its usefulness in the diagnosis of this condition. Tuberculosis peritonitis was associated with diffuse or focal abdominal loca...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164860
更新日期:1999-06-01 00:00:00
abstract::A 48-year-old male patient was admitted to our hospital with dyspnea accompanied by orthopnea. Chest x-rays showed a cardiothoracic ratio of 68% and pulmonary congestion. He was diagnosed with dilated cardiomyopathy. Beta-Blocker (carvedilol) therapy was initiated on Day 22 of the disease using a small initial dose. H...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF02984613
更新日期:2005-05-01 00:00:00
abstract:OBJECTIVE:CBF, OEF and CMRO(2) provide us important clinical indices and are used for assessing ischemic degree in cerebrovascular disorders. These quantitative images can be measured by PET using (15)O-labelled tracers such as C(15)O, C(15)O(2) and (15)O(2). To reduce the time of scan, one possibility is to omit the u...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-010-0438-y
更新日期:2011-04-01 00:00:00