MR image corrections for PET-induced gradient distortions
نویسندگان
چکیده
منابع مشابه
Image artifacts from MR-based attenuation correction in dedicated PET/MR breast coil for PET/MR mammography
Materials and Methods Attenuation map of hybrid F-18 FDG PET/MR mammography in 38 patients diagnosed with invasive breast carcinoma were retrospectively inspected for artifacts. The artifacts were subdivided into 2 groups with minor (group A) and major artifacts (group B) on the basis of their severity. The impact of μ-map artifacts on PET interpretation was evaluated qualitatively via visual a...
متن کاملConjugate-gradient preconditioning methods for shift-variant PET image reconstruction
Gradient-based iterative methods often converge slowly for tomographic image reconstruction and image restoration problems, but can be accelerated by suitable preconditioners. Diagonal preconditioners offer some improvement in convergence rate, but do not incorporate the structure of the Hessian matrices in imaging problems. Circulant preconditioners can provide remarkable acceleration for inve...
متن کاملSoftware Development for Correction of Gradient-nonlinearity Distortions in Mr Images
A new system for functional proton radiosurgery has been proposed. The goal of the system is to target specific brain areas with high doses of proton beams with submillimeter accuracy. High-energy proton beams have exquisitely sharp lateral penumbra and are, therefore, ideal for functional radiosurgery. Localizing the anatomical target with an MRI-based fiducial system requires correction of gr...
متن کاملConjugate-Gradient Preconditioning Methods For Shift-Variant PET Image Reconstruction - Image Processing, IEEE Transactions on
Gradient-based iterative methods often converge slowly for tomographic image reconstruction and image restoration problems, but can be accelerated by suitable preconditioners. Diagonal preconditioners offer some improvement in convergence rate, but do not incorporate the structure of the Hessian matrices in imaging problems. Circulant preconditioners can provide remarkable acceleration for inve...
متن کاملThe phenomenology of body image distortions induced by regional anaesthesia.
Patients with peripheral nerve or spinal cord lesions frequently report perceptual distortions related to position, shape, texture or temperature of the affected areas. This study aimed to describe the phenomenology of such body image alterations during the course of upper limb, lower limb or spinal anaesthetic blocks in patients (n = 36) undergoing orthopaedic surgery. Multimodal sensory testi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics in Medicine & Biology
سال: 2019
ISSN: 1361-6560
DOI: 10.1088/1361-6560/aaf97a