PET attenuation coefficients from CT images: experimental evaluation of the transformation of CT into PET 511-keV attenuation coefficients
نویسندگان
چکیده
منابع مشابه
Comparing 511 keV Attenuation Maps Obtained from Different Energy Mapping Methods for CT Based Attenuation Correction of PET Data
Introduction: The advent of dual-modality PET/CT scanners has revolutionized clinical oncology by improving lesion localization and facilitating treatment planning for radiotherapy. In addition, the use of CT images for CT-based attenuation correction (CTAC) decreases the overall scanning time and creates a noise-free attenuation map (6map). CTAC methods include scaling, s...
متن کاملcomparing 511 kev attenuation maps obtained from different energy mapping methods for ct based attenuation correction of pet data
introduction: the advent of dual-modality pet/ct scanners has revolutionized clinical oncology by improving lesion localization and facilitating treatment planning for radiotherapy. in addition, the use of ct images for ct-based attenuation correction (ctac) decreases the overall scanning time and creates a noise-free attenuation map (6map). ctac methods include scaling, s...
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UNLABELLED Attenuation correction (AC) of PET images with helical CT (HCT) in PET/CT matches only the spatial resolution of CT and PET, not the temporal resolution. We therefore proposed the use of respiration-averaged CT (ACT) to match the temporal resolution of CT and PET and evaluated the improvement of tumor quantification in PET images of the thorax with ACT. METHODS First, we examined 1...
متن کاملAnalysis of biased PET images caused by inaccurate attenuation coefficients.
UNLABELLED PET scanners with an elongated axial field of view intended to increase overall system sensitivity, such as the high-resolution research tomograph (HRRT) scanner, have been reported to produce images with decreased signals in the brain stem and cerebellum. The cause of this negative bias of the images was analyzed, and the effects of an inaccurate linear attenuation coefficient (mu-v...
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The purpose of this work is to understand, quantify and minimize the impact of the emission-transmission misalignment which has been reported as a source of artefacts in cardiac PET/CT. A new and fully automatic correction algorithm is proposed to realign the μ-map contour of the left ventricle to the measured PET. PET/CT NH3 rest/stress scans were acquired for 16 patients in order to evaluate ...
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ژورنال
عنوان ژورنال: European Journal of Nuclear Medicine and Molecular Imaging
سال: 2002
ISSN: 1619-7070,1619-7089
DOI: 10.1007/s00259-002-0796-3