Prospective motion correction for 3D pseudo-continuous arterial spin labeling using an external optical tracking system |
| |
| Institution: | 1. School of Electronic Engineering, Jilin University, Changchun, Jilin, China;2. Department of Radiology, Provincial Hospital of Fujian Province, Teaching Hospital of Fujian Medical University, Fuzhou, China;3. Department of Radiology, University of Pennsylvania, Philadelphia 19104, USA;4. School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China;1. Department of Medicine, Section of Cardiology, The University of Chicago, Chicago, IL, United States;2. Department of Surgery, Section of Cardiothoracic Surgery, The University of Chicago, Chicago, IL, United States;3. Department of Radiology, The University of Chicago, Chicago, IL, United States;4. Philips, Gainesville, FL, United States.;1. Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA;2. Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA;3. Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA;4. UCSF/UC Berkeley Joint Graduate Group in Bioengineering, San Francisco, CA, USA;5. Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA;1. Mayo Graduate School, Biomedical Engineering and Physiology Track, Mayo Clinic, Rochester, Minnesota, USA;2. Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA;3. Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA;1. Department of Radiology, Weill Cornell Medical College, New York, NY, United States;2. Department of Neurology, Weill Cornell Medical College, New York, NY, United States |
| |
| Abstract: | Head motion is an unsolved problem in magnetic resonance imaging (MRI) studies of the brain. Real-time tracking using a camera has recently been proposed as a way to prevent head motion artifacts. As compared to navigator-based approaches that use MRI data to detect and correct motion, optical motion correction works independently of the MRI scanner, thus providing low-latency real-time motion updates without requiring any modifications to the pulse sequence. The purpose of this study was two-fold: 1) to demonstrate that prospective optical motion correction using an optical camera mitigates artifacts from head motion in three-dimensional pseudo-continuous arterial spin labeling (3D PCASL) acquisitions and 2) to assess the effect of latency differences between real-time optical motion tracking and navigator-style approaches (such as PROMO). An optical motion correction system comprising a single camera and a marker attached to the patient's forehead was used to track motion at a rate of 60 fps. In the presence of motion, continuous tracking data from the optical system was used to update the scan plane in real-time during the 3D-PCASL acquisition. Navigator-style correction was simulated by using the tracking data from the optical system and performing updates only once per repetition time. Three normal volunteers and a patient were instructed to perform continuous and discrete head motion throughout the scan. Optical motion correction yielded superior image quality compared to uncorrected images or images using navigator-style correction. The standard deviations of pixel-wise CBF differences between reference and non-corrected, navigator-style-corrected and optical-corrected data were 14.28, 14.35 and 11.09 mL/100 g/min for continuous motion, and 12.42, 12.04 and 9.60 mL/100 g/min for discrete motion. Data obtained from the patient revealed that motion can obscure pathology and that application of optical prospective correction can successfully reveal the underlying pathology in the presence of head motion. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
