English
TitlePhysical and Observer Performance on the Image Quality with Scintillation Camera
SubtitleNotes
AuthorsHiroyuki SHINOHARA*, Yasushi KOGA*
Authors(kana)
Organization*Department of Radiology, Fujigaoka Hospital, Showa University
JournalThe Japanese Journal of nuclear medicine
Volume18
Number6
Page845-852
Year/Month1981/7
ArticleReport
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Introduction] Spatial resolution characteristics of imaging system have been measured by objective physical performance such as FWHM or MTF, or subjectively in terms of organ or bar phantom. These common method have the advantage of being simple to perform. However the method does not always approximate the clinical problem (namely, the detection of a focal lesion within an activity distribution). 1) Rollo and Schulz developed the concept of contrast efficiency which was defined to quantitatively measure how well an imaging system will detect a spherical void of activity within an activity distribution. On the basis of their theory, Rollo proposed Rollo (overall performance)phantom. The phantom was designed so that images obtained with a given system could be subjectively or quantitatively evaluated. We made a modified Rollo phantom and used for visual evaluation of 99mTc scintiphotos, made with the same scintillation camera but with different collimators. The obtained results were discussed with the difference of spatial resolution for three collimator systems measured by physical performance. The advantage and disadvantage of modified Rollo phantom was discussed.
PracticeClinical medicine
KeywordsPhysical performance, Observer performance, Modified Rollo phantom

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