Physiological myocardial F-FDG uptake pattern in oncologic PET/CT: comparison with findings in cardiac sarcoidosis.

Objectives: Physiological myocardial F-fluorodeoxyglucose (F-FDG) uptake in oncologic positron emission tomography (PET)/computed tomography (CT) is commonly observed with multiple variations under clinical fasting conditions. The purpose of the present study was to evaluate physiological myocardial F-FDG uptake pattern by comparing with the results in cardiac sarcoidosis.

Methods: A total of 174 examinations in 174 patients without cardiac disease and 27 examinations in 17 patients with cardiac sarcoidosis were performed.

Evaluating the effect of high-density measurement mode on patient-specific quality assurance for head and neck cancer with ArcCHECK.

The high-density measurement (HDm) mode of the ArcCHECK device can achieve a twofold resolution enhancement compared to the standard measurement (Sm) mode. The aim of this study was to evaluate the effect of HDm on the gamma passing rate (GPR) for the patient-specific quality assurance (PSQA) in head and neck cancer. We retrospectively evaluated 30 patients who underwent volumetric modulated arc therapy (VMAT) for head and neck cancer.

[Influence of the Imaging Method on Regional Cerebral Blood Flow Value in Arterial Spin Labeling (ASL): Comparison of Pulsed-ASL with Two-dimensional Acquisition and Pseudo-continuous-ASL with 3D Spiral Acquisition].

Purpose: The purposes of this study were to compare regional cerebral blood flow (rCBF) images acquired by the pulsed arterial spin labeling with two-dimensional acquisition (PASL-2D) and the pseudo-continuous-ASL with three-dimensional spiral acquisition (pCASL-3D spiral), and to clarify the characteristics of rCBF values in both ASL methods.

Methods: PASL-2D and pCASL-3D spiral were performed in five healthy volunteers with no history of brain disease using 3T scanners from two venders in the same center. 3D T-weighted images and rCBF images were acquired by both ASL methods for a total of 3 sessions: twice at the initial visit (1st and 2nd), and 1 hour and 1 week later.

[Investigation of the Administration Accuracy of an Auto Infusion Device in F-FDG PET].

Purpose: The administration accuracy of the automated infusion device for the positron emission radiopharmaceutical affects to calculation of the standardized uptake value (SUV) in F-fluorodeoxyglucose (F-FDG) PET examination. The purpose of this study was to investigate the administration error in the clinical use of an automated infusion device for quantitative management in PET examination.

Methods: We assumed clinical use of the automated infusion device and investigated two types of administration errors.

Texture Indices of 18F-FDG PET/CT for Differentiating Squamous Cell Carcinoma and Non-Hodgkin's Lymphoma of the Oropharynx.

We assessed the role of 18F-FDG PET/CT texture indices for the differentiation of squamous cell carcinoma (SCC) and non-Hodgkin's lymphoma (NHL) in the oropharynx. 18F-FDG PET/CT data for 27 patients with SCC and 25 patients with NHL in the oropharynx were investigated. The maximum standardized uptake value (SUVmax), metabolic tumor volume (MTV), total lesion glycolysis (TLG), and six texture indices (homogeneity, entropy, short-run emphasis, long-run emphasis, low gray-level zone emphasis [LGZE], and high graylevel zone emphasis [HGZE]) were derived from PET images.

Effect of quantitative values on shortened acquisition duration in brain tumor C-methionine PET/CT.

Background: The amount of signal decreases when the acquisition duration is shortened. However, it is not clear how this affects the quantitative values. This study aims to clarify the effect of acquisition time shortening in brain tumor PET/CT using C-methionine on the quantitative values.

[Creation of Stereo-paired Bone Anatomical Charts Using Human Bone Specimens for Radiation Education].

In radiological examinations of patients, we often take stacked images and three-dimensional (3D) images of human bone radiological images such as X-ray images and CT images. In general, learning of bone structure using specialized anatomy books is currently performed at medical radiological technologist education facilities. In the anatomy education of the medical school, in order to understand the structure of human and the individual bone shapes in detail, a real human bone specimen is used to gain knowledge of skeleton, bone shape, bone name and bone function.

Accuracy of target delineation by positron emission tomography-based auto-segmentation methods after deformable image registration: A phantom study.

Purpose: Diagnostic positron emission tomography and computed tomography (PET/CT) images can be fused to the planning CT images by a deformable image registration (DIR). The aim of this study was to evaluate the standardized uptake value (SUV) and target delineation on deformed PET images.

Methods: We used a cylindrical phantom and removable inserts of four spheres (16-38 mm in diameter) and three ellipsoids with a volume equal to the 38-mm-diameter sphere (S38) in each.

Efficacy of a Nonrigid Image-registration Method in Comparison to Readout-segmented Echo-planar Imaging for Correcting Distortion in Diffusion-weighted Imaging.

We evaluated the effectiveness of distortion correction using a nonrigid image registration method in diffusion-weighted imaging, comparing it with readout-segmented echo planar imaging (RS-EPI). Unlike the RS-EPI, the effectiveness of the distortion correction of the nonrigid registration method depended on the slice level, being most accurate at the level of the basal ganglia, lateral ventricle, and centrum semiovale.

[Investigation of Radioactivity Concentration of the Normal Brain Region for the Phantom Experiment in Brain Tumor PET Imaging].

Purpose: There are few reports focusing on the radioactivity concentration in the normal brain region for the phantom experiment. We investigated the radioactivity concentration of normal brain regions for the phantom experiment of brain tumor PET imaging.

Methods: A total of 30 patients (age: 53±19 years old, body weight: 58±11 kg) underwent the brain tumor PET examinations using F-fluorothymidine (F-FLT), F-fluoromisonidazole (F-FMISO) and C-methionine (C-MET) during April 1, 2017-October 1, 2017.

[Evaluation of optimal parameters for non-contrast-enhanced non-breath-holding pulmonary artery MRA using 3D-FSE imaging with variable flip angle echo trains].

Purpose: The aim of this study was to find the optimal acquisition parameters of non-contrast-enhanced non-breath-holding pulmonary artery MRA using 3D-FSE imaging with variable flip angle echo trains.

Materials And Methods: The 3D-FSE imaging method with variable flip angle echo trains (CUBE) was employed in this study. Pulmonary artery MRA was performed in five healthy volunteers using a 1.