Abstract:
OBJECTIVE:Radium-223 (223Ra) is used in unsealed radionuclide therapy for metastatic bone tumors. The aim of this study is to apply a computational model observer to 223Ra planar images, and to assess the performance of collimators in 223Ra imaging. METHODS:The 223Ra planar images were created via an in-house Monte Carlo simulation code using HEXAGON and NAI modules. The phantom was a National Electrical Manufacturers Association body phantom with a hot sphere. The concentration of the background was 55 Bq/mL, and the sphere was approximately 1.5-20 times that of the background concentration. The acquisition time was 10 min. The photopeaks (and the energy window) were 84 (full width of energy window: 20%), 154 (15%), and 270 keV (10%). Each 40 images, with and without hot concentration, were applied to a three-channel difference-of-Gaussian channelized Hotelling observer (CHO), and the signal-to-noise ratio (SNR) of the hot region was calculated. The images were examined using five different collimators: two low-energy general-purpose (LEGP), two medium-energy general-purpose (MEGP), and one high-energy general-purpose (HEGP) collimators. RESULTS:The SNR value was linearly proportional to the contrast of the hot region for all collimators and energy windows. The images of the 84-keV energy window with the MEGP collimator that have thicker septa and larger holes produced the highest SNR value. The SNR values of two LEGP collimators were approximately half of the MEGP collimators. The HEGP collimator was halfway between the MEGP and LEGP. Similar characteristics were observed for other energy windows (154, 270 keV). The SNR value of images captured via the 270-keV energy window was larger than 154-keV, although the sensitivity of the 270-keV energy window is lower than 154-keV. The results suggested a positive correlation between the SNR value and the fraction of unscattered photons. CONCLUSIONS:The SNR value of CHO reflected the performance of collimators and was available to assess and quantitatively evaluate the collimator performance in 223Ra imaging. The SNR value depends on the magnitudes of unscattered photon count and the fraction of unscattered photon count. Consequently, in this study, MEGP collimators performed better than LEGP and HEGP collimators for 223Ra imaging.
journal_name
Ann Nucl Medjournal_title
Annals of nuclear medicineauthors
Takahashi A,Baba S,Sasaki Mdoi
10.1007/s12149-018-1286-4subject
Has Abstractpub_date
2018-12-01 00:00:00pages
649-657issue
10eissn
0914-7187issn
1864-6433pii
10.1007/s12149-018-1286-4journal_volume
32pub_type
杂志文章abstract:OBJECTIVE:In mCRPC patients treated with 223Ra, a major issue is the validation of reliable prognostic and predictive biomarkers to maximize clinical benefit and minimize toxicities and costs. Bearing in mind how changes in tALP did not meet statistical requirements as surrogate marker for survival, aim of this single-...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-017-1228-6
更新日期:2018-02-01 00:00:00
abstract:OBJECTIVE:Bone-seeking radiopharmaceuticals have the main role in the treatment of painful bone metastases. The aim of this study was to dosimetrically compare radiopharmaceuticals in use for bone pain palliation therapy and bone scan. METHODS:The MCNPX code was used to simulate the radiation transport in a vertebral ...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-019-01329-w
更新日期:2019-04-01 00:00:00
abstract:OBJECTIVE:To investigate the potential role of Tc-99m depreotide (Tc-DEPR) in the preoperative lymph node (N) staging of non-small-cell lung cancer (NSCLC). METHODS:Sixty-one patients with NSCLC at the potentially operable stage were enrolled and underwent scintigraphy before surgery (n=56) or mediastinoscopy (n=5). I...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-014-0839-4
更新日期:2014-06-01 00:00:00
abstract::99mTc-tetrofosmin, Thallium-201-chloride (201Tl) and 99mTc-MIBI imagings were performed in a patient with malignant thymoma. Tracer uptake in the primary tumor was demonstrated. The tumor-to-background ratios of planar and SPECT imagings were 1.60 and 1.98 for 99mTc-tetrofosmin, 1.12 and 2.09 for 201Tl, and 1.19 and 1...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF02988212
更新日期:2000-08-01 00:00:00
abstract:OBJECTIVE:Because of the urinary excretion of fluorine-18 fluorodeoxyglucose ((18)F-FDG), FDG-PET or PET/CT is thought of little value in patients with bladder cancer. The purpose of our study was to investigate the value of (18)F-FDG PET/CT with additional pelvic images in detection of recurrent bladder cancers. METH...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-012-0614-3
更新日期:2012-08-01 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:An iterative reconstruction method in combination with resolution recovery, attenuation and scatter corrections (IR-RASC) can improve image quality. It, however, is undetermined whether this technique can improve the detection of coronary artery disease (CAD) when automated quantitative analysis is used. This...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-016-1146-z
更新日期:2017-02-01 00:00:00
abstract::Positron emission tomography (PET) by means of a dynamic state method and H2(15)O was performed to quantify splenic blood flow in 20 patients who had no hepatic functional disorders. Non-linear regression analysis was applied to determine splenic blood flow. In calculating arterial input function for the spleen, our o...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164705
更新日期:1993-11-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to determine whether (11)C-hydroxyephedrine ((11)C-HED) can predict adverse events including all-cause death in Japanese patients with left ventricular (LV) dysfunction. BACKGROUND:Although (11)C-HED PET has been used to assess cardiac sympathetic innervation in various disease con...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-016-1081-z
更新日期:2016-08-01 00:00:00
abstract::This study evaluates the regional cerebral blood flow (CBF) with H2(15)O-PET and the distribution of central benzodiazepine receptor (BZR) with C-11 flumazenil (FMZ) by PET and I-123 iomazenil (IMZ) by SPECT in Alzheimer's disease (AD). In AD, whereas the CBF was diminished in the frontal, temporal, parietal, and occi...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164869
更新日期:1999-10-01 00:00:00
abstract:OBJECTIVES:Visceral leishmaniasis (VL) is the most severe manifestation of the infection caused by the protozoan Leishmania, recently on increase in Italy and Spain. The aim of the study was to describe FDG uptake patterns in VL patients (pts) who underwent 18F-FDG PET/CT. METHODS:A retrospective monocentric study of ...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-019-01381-6
更新日期:2019-09-01 00:00:00
abstract:OBJECTIVE:To evaluate the usefulness of a breath-holding (BH) (18)F-2-fluoro-2-deoxy-D-glucose positron emission tomography ((18)F-FDG-PET) technique for PET/computed tomography (CT) scanning of pulmonary lesions near the diaphragm, where image quality is influenced by respiratory motion. METHODS:In a basic study, sim...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-008-0206-4
更新日期:2009-01-01 00:00:00
abstract:OBJECTIVE:Attenuation correction (AC) on nuclear images of non-uniform domains is generally performed by a change of the computed tomography (CT) values to μ values, which are then inserted as components into the detection probability of iterative reconstruction techniques (OS-EM Iterative AC). We established an AC tec...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-015-0972-8
更新日期:2015-06-01 00:00:00
abstract:BACKGROUND:Rest thallium-201 (201Tl) myocardial perfusion imaging has been widely used for evaluation of myocardial ischemia/viability after myocardial infarction, but the ideal timing for imaging after injection to maximally estimate viability is not well established. METHODS:Thirty-six patients with myocardial infar...
journal_title:Annals of nuclear medicine
pub_type: 临床试验,杂志文章
doi:10.1007/BF02985586
更新日期:2006-01-01 00:00:00
abstract:OBJECTIVE:Respiratory motion causes loss of image quality and inaccuracy of quantification in oncologic positron emission tomography (PET) imaging. This study introduces a bioimpedance-based gating method for compensation of respiratory motion artefacts. METHODS:The bioimpedance-based respiratory gating method was stu...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-015-0953-y
更新日期:2015-05-01 00:00:00
abstract::We report here a patient with mucosa associated lymphoid tissue (MALT)-lymphoma of the breast complicated with Sjögren syndrome. It is speculated that Ga-67 could accumulate not only in lymphoma lesions but also in benign lymphoproliferative locations of Sjögren syndrome. Gallium-67 scintigraphy might be useful for th...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF02987866
更新日期:2000-06-01 00:00:00
abstract:OBJECTIVE:Currently, the diagnosis of bone flap osteomyelitis (BFO) remains a challenge for medical imaging. The present study aimed to identify predictive scintigraphic patterns of BFO. METHODS:This retrospective study reviewed planar bone scan of patients with suspected BFO between 2010, and 2016. A total of 15 pati...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-019-01351-y
更新日期:2019-06-01 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::The purpose of this study was to examine the normal distribution patterns of 99mTc-HMPAO (HMPAO) in young and aged normal individuals and to clarify differences between the distribution patterns of the two groups by means of an anatomical standardization technique. The tracer distribution was measured with HMPAO and S...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164922
更新日期:1998-12-01 00:00:00
abstract:OBJECTIVE:Radioiodide is commonly used to diagnose and treat hyperthyroidism and thyroid carcinoma. However, we could not find any experimental data that strictly compared the biodistribution and thyroid uptake of radioactive iodide between the oral and intravenous (iv) routes with time. This prompted us to compare (12...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-014-0909-7
更新日期:2014-12-01 00:00:00
abstract:BACKGROUND:Despite recent technological advances allowing for quantitative single-photon emission computed tomography (SPECT), quantitative SPECT has not been widely used in the clinical practice of osteoporosis. The aim of this study is to evaluate the feasibility of quantitative bone SPECT/CT for measuring lumbar sta...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-019-01425-x
更新日期:2020-02-01 00:00:00
abstract:OBJECTIVE:In high-risk patients with left bundle-branch block (LBBB), functional but not perfusion parameters yield incremental prognostic information. The aim of our study was to evaluate the prognostic value of gated single photon emission computed tomography (SPECT) in low-intermediate risk LBBB patients. METHODS:O...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-012-0613-4
更新日期:2012-08-01 00:00:00
abstract:OBJECTIVE:In clinical practice, measurement of the rCBF has mainly been conducted by I-123-N-isopropyl-p-iodoamphetamine ((123)I-IMP) SPECT using the microsphere (MS) method, with continuous arterial blood sampling. While several non-invasive (123)I-IMP quantification methods have been developed, their accuracy has bee...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/s12149-015-1053-8
更新日期:2016-04-01 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::Physiological functions (e.g., cerebral blood flow, glucose metabolism, and neuroreceptor binding) can be investigated as parameters estimated by kinetic modeling using dynamic positron emission tomography (PET) images. Imaging of these physiological parameters, called parametric imaging, can locate the regional distr...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章,评审
doi:10.1007/s12149-007-0044-9
更新日期:2007-09-01 00:00:00
abstract::Reported here is a case of an inferior mesenteric varix demonstrated by 99mTc-red blood cell (RBC) scintigraphy performed for gastrointestinal bleeding in a 47-year-old man. It was shaped like a question mark ranging from the left upper abdomen to the pelvis. This is the first report of scintigraphic recognition of an...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03164828
更新日期:1997-05-01 00:00:00
abstract::Written by associate editors of the Annals of Nuclear Medicine, this invited review article is intended to offer our readers a condensed global view on the high-quality research work that has been published in Europe last year. We have divided this article into five sections. The first three sections from the oncology...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章,评审
doi:10.1007/s12149-018-1303-7
更新日期:2018-11-01 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::Morphine intervention in cholescintigraphy decreases imaging time to diagnose acute cholecystitis. Not infrequently we observe duodenogastric reflux during scintigraphy with and without morphine intervention. To evaluate occurrence of duodenogastric reflux related to morphine, we reviewed 55 patients who underwent cho...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03168405
更新日期:1995-11-01 00:00:00
abstract:UNLABELLED:The purpose of this study is to determine the subcellular distribution of thallium (SDTl) by electron microscopy and a newly designed fixation method that makes insoluble grains of Tl visible. METHODS:To obtain the high dose necessary for electron microscopic visualization, we employed TlCl instead of 201Tl...
journal_title:Annals of nuclear medicine
pub_type: 杂志文章
doi:10.1007/BF03165296
更新日期:1997-11-01 00:00:00