Is your system calibrated? MRI gradient system calibration for pre-clinical imaging
نویسندگان
چکیده
Figure 3 Displacement fields generated by the post processing correction in the z (a), x (b), and y (c) directions. Insert show CT and MRI alignment before and after registraion Figure 1 Phantom schematic: a) grid section, b) chamber, c) chamber cap, d) s-bend to trap air bubbles, e) filling cap, f) isocentre marker 7437 Is your system calibrated? MRI gradient system calibration for pre-clinical imaging James Martin O'Callaghan, Jack Wells, Simon Richardson, Holly Holmes, Yichao Yu, Bernard Siow, and Mark Lythgoe Centre for Advanced Biomedical Imaging, UCL, London, UK, United Kingdom, Centre for Medical Image Computing, UCL, UK, United Kingdom
منابع مشابه
Is Your System Calibrated? MRI Gradient System Calibration for Pre-Clinical, High-Resolution Imaging
High-field, pre-clinical MRI systems are widely used to characterise tissue structure and volume in small animals, using high resolution imaging. Both applications rely heavily on the consistent, accurate calibration of imaging gradients, yet such calibrations are typically only performed during maintenance sessions by equipment manufacturers, and potentially with acceptance limits that are ina...
متن کاملEfficient gradient calibration based on diffusion MRI
PURPOSE To propose a method for calibrating gradient systems and correcting gradient nonlinearities based on diffusion MRI measurements. METHODS The gradient scaling in x, y, and z were first offset by up to 5% from precalibrated values to simulate a poorly calibrated system. Diffusion MRI data were acquired in a phantom filled with cyclooctane, and corrections for gradient scaling errors and...
متن کاملComparison of the Obtained Results from Two Calibration Methods in MRI Brachytherapy Normoxic Polymer Gel Dosimetry
Introduction: Despite the fact that the clinical implementation of polymer gel dosimetry has been facilitated after the introduction of normoxic gels, there are still complications in its clinical routine use that are under investigation. In the current work, the feasibility of using a normoxic polymer gel dosimeter named MAGICA has been investigated for use in our clinical brachytherapy applic...
متن کاملDevelopment of an Advanced Optical Coherence Tomography System for Radiation Dosimetry
Introduction: According to the literature, optical coherence tomography (OCT) can be used measure radiation absorbed dose. This study was carried out to design a computed tomography system for the calculation of absorbed dose and optimization of dose delivery in radiotherapy using gel dosimeters. Material and Methods: An advanced charge-coupled device based OCT system was developed in laborator...
متن کاملMagnetic Resonance Imaging of Central Nervous System and Paranasal Sinuses in Multiple Sclerosis Patients: Findings from a Survey of Clinical Records in Kermanshah Province
Background and Objectives: Multiple sclerosis (MS) is the most common demyelinating disease of the central nervous system with more than 5.2 million people across the world being afflicted with. Magnetic Resonance Imaging (MRI) is a valuable tool in the diagnosis of MS. This study surveys the results of MRI of the central nervous system and paranasal sinuses in the sample of MS patients in Ker...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2014