Subject(s)
Breast/diagnostic imaging , Positron-Emission Tomography/instrumentation , Positron-Emission Tomography/methods , Breast Neoplasms/diagnostic imaging , Breast Neoplasms/drug therapy , Breast Neoplasms/genetics , Female , Fluorodeoxyglucose F18 , Humans , Insurance , Japan , Occupational Exposure/prevention & control , Radiation Dosage , Radiopharmaceuticals , Risk , Whole Body Imaging/instrumentation , Whole Body Imaging/methodsABSTRACT
This synopsis outlines the Japanese guideline Version 2.0 for the data acquisition protocol of oncology FDG-PET/CT scans that was created by a joint task force of the Japanese Society of Nuclear Medicine Technology, the Japanese Society of Nuclear Medicine and the Japanese Council of PET Imaging, and was published in Kakuigaku-Gijutsu 2013; 33:377-420 in Japanese. The guideline aims at standardizing the PET image quality among PET centers and different PET camera models by providing criteria for the IEC body phantom image quality as well as for the patient PET image quality based on the noise equivalent count (NEC), NEC density and liver signal-to-noise ratio, so that the appropriate scanning parameters can be determined for each PET camera. This Version 2.0 covers issues that were not focused on in Version 1.0, including the accuracy of the standardized uptake value (SUV), effect of body size together with adjustment of scanning duration, and time-of-flight (TOF) reconstruction technique. Version 2.0 also presents data acquired with new PET camera models that were not tested in Version 1.0. Reference values for physical indicators of phantom image quality have been updated as well.
Subject(s)
Fluorodeoxyglucose F18 , Image Processing, Computer-Assisted/methods , Multimodal Imaging/methods , Positron-Emission Tomography/methods , Tomography, X-Ray Computed/methods , Body Size , Humans , Japan , Phantoms, Imaging , Scattering, RadiationABSTRACT
This synopsis outlines the Japanese guideline Version 1.0 for the data acquisition protocol of oncology FDG-PET/CT scans that was created by a joint task force of the Japanese Society of Nuclear Medicine Technology (JSNMT) and the Japanese Council of PET Imaging, and published in Kakuigaku-Gijutsu 29(2):195-235, 2009, in Japanese. The guideline aims at standardizing the PET image quality among facilities and different PET/CT scanner models by determining and/or evaluating the data acquisition condition in experiments using an IEC body phantom, as well as by proposing the criteria for human image quality evaluation using patient noise equivalent count (NEC), NEC density, and liver signal-to-noise ratio.
Subject(s)
Fluorodeoxyglucose F18 , Neoplasms/diagnostic imaging , Positron-Emission Tomography/methods , Tomography, X-Ray Computed/methods , Humans , Japan , Phantoms, Imaging , Positron-Emission Tomography/standards , Quality Control , Tomography, X-Ray Computed/standardsABSTRACT
OBJECTIVE: In FDG-PET examinations, optimization of the injected dose and duration of acquisition are important in determining the physical performance of PET or the PET/CT scanner. This study was intended to elucidate the influence of count rate on image quality. METHODS: Three PET/CT scanners (Biograph sensation 16, Discovery ST, and Aquiduo) were used in this study. Body and scatter phantoms (NEMA 2001) and a cylindrical phantom (for QC use) were also used. Data acquisition was performed repeatedly for about 6 h to achieve a fixed 15 million counts of true plus scatter. The count rate performance and image quality (signal-to-noise ratio and contrast) of each frame were analyzed after data acquisition. The relationship between the count rate and image quality was also analyzed. RESULTS: A positive correlation between the random fraction (ratio of random to prompt count rate) and signal-to-noise ratio was found in all PET/CT scanners, but with differing effects of the count rate's influence on image quality. Image contrast was not correlated with count rate. CONCLUSION: Acquisition parameters must be determined by considering each scanner's effect on how count rate influences image quality.
Subject(s)
Imaging, Three-Dimensional/methods , Positron-Emission Tomography/methods , Fluorine Radioisotopes , Fluorodeoxyglucose F18 , Imaging, Three-Dimensional/instrumentation , Phantoms, Imaging , Positron-Emission Tomography/instrumentation , RadiopharmaceuticalsABSTRACT
The purpose of this study was to develop an efficient method of determining gate-on and -off timing in respiration-gated radiotherapy. Gate-on and -off timing in a breathing cycle were defined as the respiratory signal level for the start of irradiation (Ls) in the expiration phase and that for the end of irradiation (Le) in the inspiration phase, respectively. Thirty subjects participated in this study. The diaphragm was used as the tracking target, and time-dependent changes in the position of the target were measured together with those in the respiratory signal level. For each subject, the following maps were created by varying the combination of Ls and Le: absolute target displacement (ATD) map, relative target displacement (RTD) map, and gate-on duty cycle (GDC) map. By classifying respiratory signal waveforms, three respiratory types were derived (A: the length of end-expiration level >40% of a breathing cycle, B: the length of end-expiration level Subject(s)
Radiotherapy, Computer-Assisted/methods
, Respiration
, Respiratory Physiological Phenomena
, Adult
, Aged
, Algorithms
, Diaphragm/physiology
, Female
, Humans
, Male
, Middle Aged
