A programmable data acquisition and control system for magnetic resonance imaging: application to mutually coupled surface coil arrays and temperature monitoring

1991 ◽  
Vol 38 (6) ◽  
pp. 608-613
Author(s):  
J.R. Kelton ◽  
S.M. Wright ◽  
R.L. Magin
Keyword(s):  
Magnetic Resonance Imaging ◽  
Control System ◽  
Magnetic Resonance ◽  
Data Acquisition ◽  
Surface Coil ◽  
Temperature Monitoring ◽  
Resonance Imaging ◽  
Imaging Application ◽  
Coil Arrays ◽  
And Control

scholarly journals Design and control of a novel magnetic resonance imaging-compatible breast intervention robot

2020 ◽  
Vol 17 (3) ◽  
pp. 172988142092785
Author(s):  
Mingyue Lu ◽  
Yongde Zhang ◽  
Haiyan Du
Keyword(s):  
Magnetic Resonance Imaging ◽  
Control System ◽  
Magnetic Resonance ◽  
Simulation Analysis ◽  
Needle Insertion ◽  
Resonance Imaging ◽  
Single Chip ◽  
Robot System ◽  
Robot Positioning ◽  
And Control

Breast cancer is one of the most frequent cancers and a major cause of cancer death in women. In this article, the design and control of a novel magnetic resonance imaging-compatible breast intervention robot are proposed. The dimensions and tolerance of the robot system are considered, and a novel pitching mechanism is designed to achieve a dexterous operation in the limited space. The magnetic resonance imaging compatibility of the robot materials is tested. The nonmagnetic structure and compact Cartesian mechanism of the robot allow it to operate safely in a magnetic resonance imaging scanner. According to the robot’s structure, a kinematics analysis based on a coupled motions model is established. The workspace simulation analysis of the robot proves that it is suitable for the whole breast surgery. To control the needle insertion tasks, the overall control system in the form of “personal computer (PC) + single-chip micyoco (SCM)” is designed. Finally, the motion control experiment is carried out, and the robot positioning error is 0.37 mm, which proves that the breast intervention robot and its control system designed in this article can meet the requirements of breast intervention.

Magnetic Resonance Imaging of Spinal Cord Disease of Childhood

PEDIATRICS ◽  
1986 ◽  
Vol 78 (2) ◽  
pp. 251-256
Author(s):  
Roger J. Packer ◽  
Robert A. Zimmerman ◽  
Leslie N. Sutton ◽  
Larissa T. Bilaniuk ◽  
Derek A. Bruce ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Spinal Cord ◽  
Magnetic Resonance ◽  
Vertebral Body ◽  
Congenital Anomalies ◽  
Correct Diagnosis ◽  
Surface Coil ◽  
Resonance Imaging ◽  
Spinal Cord Disease ◽  
Magnetic Resonance Imaging Mri

Correct diagnosis of spinal cord disease in childhood is often delayed, resulting in irreversible neurologic deficits. A major reason for this delay is the lack of a reliable means to noninvasively visualize the spinal cord. Magnetic resonance imaging (MRI) should be useful in the evaluation of diseases of the spinal cord. A 1.5 Tesla MRI unit with a surface coil was used to study 41 children, including eight patients with intrinsic spinal cord lesions, eight patients with masses compressing the cord, 12 patients with congenital anomalies of the cord or surrounding bony structures, three patients with syrinxes, and three patients with vertebral body abnormalities. Intrinsic lesions of the cord were well seen in all cases as intrinsic irregularly widened, abnormally intense cord regions. MRI was helpful in following the course of disease in patients with primary spinal cord tumors. Areas of tumor were separable from syrinx cavities. Extrinsic lesions compressing the cord and vertebral body disease were also well visualized. Congenital anomalies of the spinal cord, including tethering and lipomatous tissue, were better seen on MRI than by any other radiographic technique. MRI is an excellent noninvasive "screening" technique for children with suspected spinal cord disease and may be the only study needed in many patients with congenital spinal cord anomalies. It is also an excellent means to diagnose and follow patients with other forms of intra- and extraspinal pathology.

scholarly journals Applicability of Magnetic Resonance Imaging in the Assessment of Fetal Urinary Tract Malformations

2019 ◽  
Vol 70 (1) ◽  
pp. 83-95 ◽  
Author(s):  
Tatiana Mendonça Fazecas ◽  
Edward Araujo Júnior ◽  
Heron Werner ◽  
Pedro Daltro ◽  
Alberto Borges Peixoto ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Urinary Tract ◽  
Magnetic Resonance ◽  
Three Dimensional ◽  
Surface Coil ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Urinary Tract Malformations ◽  
Weighted Sequences ◽  
Urinary Tract Anomalies

Objective To assess the applicability of magnetic resonance imaging (MRI) to complement ultrasound in the diagnosis of fetal urinary tract anomalies. Methods This was a retrospective cohort study that included 41 women between 19 weeks and 37 weeks and 6 days of gestation carrying fetuses with malformations of the urinary tract which were initially diagnosed by ultrasound and then referred for MRI. In all cases, the diagnosis was confirmed after birth either through imaging or autopsy. A surface coil was positioned over the abdomen and T2-weighted sequences were obtained in the axial, coronal, and sagittal planes; T1 in at least one plane; and three-dimensional (3-D) TRUFI in fetuses with dilatation of the urinary tract. Results Mean gestational age at the time of MRI examination was 28.21 weeks. The rapid T2 sequences allowed all the anomalies of the fetal urinary tract to be assessed, whereas 3-D TRUFI sequencing proved very useful in evaluating anomalies involving dilatation of the urinary tract. The signs of pulmonary hypoplasia characterized by hypointense signal in the T2-weighted sequences were identified in 13 of the 41 fetuses. Conclusion MRI confirmed and added information to the ultrasound regarding fetal urinary tract anomalies, as well as information related to the other associated malformations, their progress in the prenatal period, and possible postnatal prognosis.

Magnetic resonance imaging of cervical carcinoma using an endorectal surface coil

2014 ◽  
Vol 83 (7) ◽  
pp. 1030-1035 ◽  
Author(s):  
Kerstin A. Brocker ◽  
Céline D. Alt ◽  
Gerhard Gebauer ◽  
Christof Sohn ◽  
Peter Hallscheidt
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Cervical Carcinoma ◽  
Surface Coil ◽  
Resonance Imaging ◽  
Endorectal Surface Coil

scholarly journals Retino-thalamo-cortical and callosal connections visualized with manganese-enhanced magnetic resonance imaging and validated with tract tracing techniques

2020 ◽  
Author(s):  
Robyn J. Laing ◽  
Donna J Cross ◽  
Jaime Olavarria
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Longitudinal Studies ◽  
Ocular Dominance ◽  
Surface Coil ◽  
Resonance Imaging ◽  
Adult Rats ◽  
Callosal Connections ◽  
Plastic Changes

Ocular dominance columns correlate with patchy callosal connections in Long Evans rats (Laing et al., 2015). We explored in vivo manganese-enhanced magnetic resonance imaging (MEMRI) as a possible strategy for longitudinal studies of plastic changes in the retino-thalamo-cortical and callosal pathways. MnCl 2 was injected either intraocularly or intracortically to label these pathways, respectively. The transport of the paramagnetic ion Mn 2+ was evaluated by comparing images acquired both before and 36 or 12 hours after intraocular or cortical injections, respectively. Images were acquired on a 3T magnet (Philips Achieva, Philips Healthcare, Andover, MA), using a custom surface coil and a T1-weighted MPRAGE image sequence (TR/TE = 23/11 ms; Ti=1000 ms; FA= 10 deg acquired matrix 432x432 mm over 118 slices, voxel size 0.11x0.11x0.2 mm 3 ). To validate the transport of Mn 2+ , each animal also received either an intraocular injection of the transneuronal tracer WGA-HRP, or cortical injections of HRP. Following monocular injections of MnCl 2 , MRI images showed significant, bilateral accumulations of Mn 2+ in regions of the SC, LGN and visual cortex that corresponded with regions labeled with HRP. In adult rats monocularly enucleated at birth, we injected MnCl 2 in the hemisphere contralateral to the remaining eye in an attempt to detect anomalies reported previously in the callosal pattern ipsilateral to the remaining eye. After the scans, the hemisphere injected with MnCl 2 was injected with HRP. MRI images revealed Mn 2+ patterns that closely resembled the callosal patterns demonstrated with HRP in the same animal. Our results suggest that both transneuronal retino-thalamo-cortical, as well as cortico-cortical transport of Mn 2+ provide potentially useful strategies for longitudinal studies of plastic changes in these pathways.

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