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Quantitative Imaging in Medicine and Surgery

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https://www.readbyqxmd.com/read/28516053/implication-of-pulmonary-systemic-flow-information-in-the-management-of-complex-presentation-of-pulmonary-arterial-hypertension-exploring-role-of-phase-contrast-mri-technique
#1
Karthik Gadabanahalli, Venkatraman Bhat, Pradeep Kumar, Murali Mohan
No abstract text is available yet for this article.
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516052/whole-body-mri-of-the-non-human-primate-using-a-clinical-3t-scanner-initial-experiences
#2
Chun-Xia Li, Xiaodong Zhang
With the advent of parallel imaging MRI techniques, whole-body MRI is being increasingly used in clinical diagnosis. However, its application in preclinical research using large animals remains very limited. In the present study, the whole-body MRI techniques for adult macaque monkeys were explored using a conventional clinic 3T scanner. The T1, T2 anatomical images, and MR angiography of adult macaque whole bodies were illustrated. The preliminary results suggest whole-body MRI can be a robust tool to examine multiple organs of non-human primate (NHP) models from head to toe non-invasively and simultaneously using a conventional clinical setting...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516051/evaluation-of-mr-thermometry-with-proton-resonance-frequency-method-at-7t
#3
Ping Wang
Quantitative and non-invasive temperature mapping using magnetic resonance imaging (MRI) provides a unique way to measure temperature evolution inside biological tissues. The method is widely used in thermal ablation procedures with magnetic fields at or below 3T. In this paper, the sensitivity of the MRI thermometry at 7T was studied using a proton resonance frequency (PRF)-based technique. We first used an agarose gel phantom with MR-compatible thermometry to calibrate the temperature coefficient, and then this temperature coefficient was employed to measure the internal temperature in both ex vivo (beef muscle) and in vivo (rat) experiments using focused ultrasound heating...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516050/towards-mri-temperature-mapping-in-real-time-the-proton-resonance-frequency-method-with-undersampled-radial-mri-and-nonlinear-inverse-reconstruction
#4
Zhongshuai Zhang, Thomas Michaelis, Jens Frahm
BACKGROUND: Optimal control of minimally invasive interventions by hyperthermia requires dynamic temperature mapping at high temporal resolution. METHODS: Based on the temperature-dependent shift of the proton resonance frequency (PRF), this work developed a method for real-time MRI thermometry which relies on highly undersampled radial FLASH MRI sequences with iterative image reconstruction by regularized nonlinear inversion (NLINV). As a first step, the method was validated with use of a temperature phantom and ex vivo organs (swine kidney) subjected to heating by warm water or a pulsed laser source...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516049/analysis-of-phase-error-effects-in-multishot-diffusion-prepared-turbo-spin-echo-imaging
#5
Anh T Van, Barbara Cervantes, Hendrik Kooijman, Dimitrios C Karampinos
BACKGROUND: To characterize the effect of phase errors on the magnitude and the phase of the diffusion-weighted (DW) signal acquired with diffusion-prepared turbo spin echo (dprep-TSE) sequences. METHODS: Motion and eddy currents were identified as the main sources of phase errors. An analytical expression for the effect of phase errors on the acquired signal was derived and verified using Bloch simulations, phantom, and in vivo experiments. RESULTS: Simulations and experiments showed that phase errors during the diffusion preparation cause both magnitude and phase modulation on the acquired data...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516048/image-interpolation-improves-the-zonal-analysis-of-cartilage-t2-relaxation-in-mri
#6
Farid Badar, Yang Xia
BACKGROUND: This project aimed to investigate the improvement in the detection of osteoarthritis (OA) in cartilage by the interpolation of T2 images, in the situation when the native MRI resolution is insufficient to resolve the depth-dependent T2 characteristics in articular cartilage (AC). METHODS: Eighteen intact canine knee joints that were healthy or had mild (contralateral) or severe OA were T2-imaged in a 7T/20 cm MRI system at 200 µm/pixel resolution (macro-MRI)...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516047/prospective-cardiac-motion-self-gating
#7
Fei Han, Stanislas Rapacchi, Peng Hu
BACKGROUND: To develop a prospective cardiac motion self-gating method that provides robust and accurate cardiac triggers in real time. METHODS: The proposed self-gating method consists of an "imaging mode" that acquires the k-space segments and a "self-gating mode" that captures the cardiac motion by repeatedly sampling the k-space centerline. A training based principal component analysis algorithm is utilized to process the self-gating data where the projection onto the first principal component was used as the self-gating signal...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516046/image-quality-assessment-of-a-1-5t-dedicated-magnetic-resonance-simulator-for-radiotherapy-with-a-flexible-radio-frequency-coil-setting-using-the-standard-american-college-of-radiology-magnetic-resonance-imaging-phantom-test
#8
Oi Lei Wong, Jing Yuan, Siu Ki Yu, Kin Yin Cheung
BACKGROUND: A flexible RF coil setting has to be used on an MR-simulator (MR-sim) in the head and neck simulation scan for radiotherapy (RT) purpose, while the image quality might be compromised due to the sub-optimized flexible coil compared to the normal diagnostic radiological (DR) head coil. In this study, we assessed the image quality of an MR-sim by conducting the standard American College of Radiology (ACR) MRI phantom test on a 1.5T MR-sim under RT-setting and comparing it to DR-setting...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516045/exploration-of-highly-accelerated-magnetic-resonance-elastography-using-high-density-array-coils
#9
John C Bosshard, Naresh Yallapragada, Mary P McDougall, Steven M Wright
BACKGROUND: Magnetic resonance elastography (MRE) measures tissue mechanical properties by applying a shear wave and capturing its propagation using magnetic resonance imaging (MRI). By using high density array coils, MRE images are acquired using single echo acquisition (SEA) and at high resolutions with significantly reduced scan times. METHODS: Sixty-four channel uniplanar and 32×32 channel biplanar receive arrays are used to acquire MRE wave image sets from agar samples containing regions of varying stiffness...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516044/design-of-catheter-radio-frequency-coils-using-coaxial-transmission-line-resonators-for-interventional-neurovascular-mr-imaging
#10
Xiaoliang Zhang, Alastair Martin, Caroline Jordan, Prasheel Lillaney, Aaron Losey, Yong Pang, Jeffrey Hu, Mark Wilson, Daniel Cooke, Steven W Hetts
BACKGROUND: It is technically challenging to design compact yet sensitive miniature catheter radio frequency (RF) coils for endovascular interventional MR imaging. METHODS: In this work, a new design method for catheter RF coils is proposed based on the coaxial transmission line resonator (TLR) technique. Due to its distributed circuit, the TLR catheter coil does not need any lumped capacitors to support its resonance, which simplifies the practical design and construction and provides a straightforward technique for designing miniature catheter-mounted imaging coils that are appropriate for interventional neurovascular procedures...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516043/quantification-of-regional-deformation-of-the-lungs-by-non-rigid-registration-of-three-dimensional-contrast-enhanced-magnetic-resonance-imaging
#11
Jiaxin Shao, Peng Hu
BACKGROUND: Assessment of lung function is vital for the diagnosis of a variety of pathological conditions. Research has been proposed to study pulmonary mechanics and kinematics using two-dimensional (2D) magnetic resonance imaging (MRI). This allows estimation of regional lung tissue mechanics but is limited to 2D information. An approach based on three-dimensional (3D) contrast-enhanced MR angiogram of pulmonary blood vessels and a non-rigid image registration technique is proposed for quantification of lung regional deformations, which can potentially be used for assessment of pulmonary parenchymal mechanics and regional ventilation for disease diagnosis without ionizing radiation...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516042/sensitivity-enhancement-of-traveling-wave-mri-using-free-local-resonators-an-experimental-demonstration
#12
Xiaoliang Zhang
BACKGROUND: Traveling wave MR uses the far fields in signal excitation and reception, therefore its acquisition efficiency is low in contrast to the conventional near field magnetic resonance (MR). Here we show a simple and efficient method based on the local resonator to improving sensitivity of traveling wave MR technique. The proposed method utilizes a standalone or free local resonator to amplify the radio frequency magnetic fields in the interested target. The resonators have no wire connections to the MR system and thus can be conveniently placed to any place around imaging simples...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275575/retraction-to-posterior-fossa-syndrome-a-narrative-review
#13
(no author information available yet)
[This retracts the article DOI: 10.21037/qims.2016.10.12.].
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275574/an-unusual-complication-of-dermatillomania
#14
Amer Hawatmeh, Anas Al-Khateeb
No abstract text is available yet for this article.
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275573/endovascular-management-of-a-giant-symptomatic-gluteal-artery-aneurysm-with-selective-arterial-embolization
#15
Valentin Crespy, Olivier Chevallier, Joaquim Dominguez, Caroline Kazadjian, Eric Steinmetz, Pierre Pottecher, Romaric Loffroy
No abstract text is available yet for this article.
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275572/magnetic-resonance-imaging-features-of-endometrial-stromal-sarcoma-a-case-description
#16
Chen Chen, You-Qiang Hu, Xiao-Ming Zhang
No abstract text is available yet for this article.
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275571/incidental-angiographic-finding-of-extended-chronic-brachial-artery-occlusion-an-uncommon-but-unavoidable-cause-of-transradial-catheterisation-failure
#17
Antonio Zingarelli
No abstract text is available yet for this article.
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275570/transcatheter-embolization-of-a-large-aberrant-systemic-artery-to-an-intralobar-pulmonary-sequestration-using-an-amplatzer-vascular-plug-in-an-adolescent
#18
Pierre-Emmanuel Berthod, Olivier Chevallier, Pierre Pottecher, Sophie Gehin, Emmanuel Sapin, Romaric Loffroy
No abstract text is available yet for this article.
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275569/unexpected-transesophageal-echocardiography-tee-finding-mediastinal-lipomatosis-fakes-an-aortic-intramural-haematoma
#19
Gemma Salerno, Andreina Carbone, Gaetano Rea, Tullio Valente, Antonello D'Andrea, Marco Di Maio, Giuseppe Limongelli, Maurizio Muto, Giuseppe Pacileo
No abstract text is available yet for this article.
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275568/diagnostic-clues-of-organizing-pneumonia-a-case-presentation
#20
Gaetano Rea, Maria Pignatiello, Luca Longobardi, Angela Barbieri, Salvatore Cappabianca, Tullio Valente
No abstract text is available yet for this article.
February 2017: Quantitative Imaging in Medicine and Surgery
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