PEMERIKSAAN STATIC FLUID MAGNETIC RESONANCE UROGRAPHY PADA ANAK DENGAN DUGAAN OBSTRUKSI TRAKTUS URINARIUS

2020 ◽  
Vol 4 (1) ◽  
pp. 37-42
Author(s):  
Nydia Rusli ◽  
Bambang Soeprijanto ◽  
Indrastuti Normahayu
Keyword(s):  
Urinary Tract ◽  
Magnetic Resonance ◽  
Obstructive Uropathy ◽  
Contrast Material ◽  
Three Dimensional ◽  
Voiding Cystourethrogram ◽  
Magnetic Resonance Urography ◽  
Dimensional Reconstruction ◽  
Static Fluid ◽  
Collecting System

Background : Static fluid Magnetic Resonance Urography (MRU) treats the urinary tract as a static column of fluid, using one of a variety of T2-weighted sequences that exploit the long T2 relaxation time of urine. It does not require the excretion of contrast material and is therefore useful for demonstrating the collecting system and ureter of an obstructed urinary tract. Static fluid MRU provides good morphology visualization and multiplanar three-dimensional reconstruction capability. Aim of study : To display the excellence of static fluid MRU in visualization of dilatated urinary tract segments in pediatric cases with suspectedurinary obstruction. Methods : Nine pediatric patients with suspected obstructive uropathy (as suggested by ultrasound) were included in this case study. The examinations were performed with 1.5T MR scanners using static fluid T2-weighted MRU sequence. Ultrasound examinations were done forall patients. Voiding cystourethrogram was done for 3 patients. Results : Eight studied patients had dilated collecting systems. Static fluid MRU can provide detailed structural assessment of dilatatedcollecting systems. It was superior to ultrasound in evaluation of obstructive double collecting system, ureteral ectopia, ureteral obstructionand massive hydroureteronephrosis.

Comparison of static-fluid or excretory magnetic resonance urography with computed tomography urography for visualization of nondilated renal pelvises and ureters in healthy Beagles

2021 ◽  
pp. 1-10
Author(s):  
Sang-Kwon Lee ◽  
Seongjae Hyeong ◽  
Soyeon Kim ◽  
Chang-Yeop Jeon ◽  
Kyung-Seob Lim ◽  
...  
Keyword(s):  
Urinary Tract ◽  
Magnetic Resonance ◽  
Contrast Medium ◽  
Imaging Techniques ◽  
Motion Artifacts ◽  
Ct Urography ◽  
Magnetic Resonance Urography ◽  
Tract Dilation ◽  
Urinary Tract Dilation ◽  
Static Fluid

Abstract OBJECTIVE To assess the usefulness of magnetic resonance urography (MRU) for the visualization of nondilated renal pelvises and ureters in dogs and to compare our findings for MRU versus CT urography (CTU). ANIMALS 9 healthy Beagles. PROCEDURES Dogs underwent CTU, static-fluid MRU, and excretory MRU, with ≥ 7 days between procedures. Contrast medium was administered IV during CTU and excretory MRU, whereas urine in the urinary tract was an intrinsic contrast medium for static-fluid MRU. For each procedure, furosemide (1 mg/kg, IV) was administered, and reconstructed dorsal plane images were acquired 3 minutes (n = 2) and 7 minutes (2) later. Images were scored for visualization of those structures and for image quality, diameters of renal pelvises and ureters were measured, and results were compared across imaging techniques. RESULTS Excretory MRU and CTU allowed good visualization of the renal pelvises and ureters, whereas static-fluid MRU provided lower visualization of the ureters. Distention of the renal pelvises and ureters was good in excretory MRU and CTU. Distention of the ureters in static-fluid MRU was insufficient compared with that in CTU and excretory MRU. Distinct artifacts were not observed in CTU and excretory MRU images. Static-fluid MRU images had several mild motion artifacts. CLINICAL RELEVANCE Our findings indicated that excretory MRU with furosemide administration was useful for visualizing nondilated renal pelvises and ureters of dogs in the present study. When performing MRU for the evaluation of dogs without urinary tract dilation, excretory MRU may be more suitable than static-fluid MRU.

Three-dimensional reconstruction of human diaphragm with the use of spiral computed tomography

1997 ◽  
Vol 82 (3) ◽  
pp. 998-1002 ◽  
Author(s):  
Nicolas Pettiaux ◽  
Marie Cassart ◽  
Manuel Paiva ◽  
Marc Estenne
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Three Dimensional ◽  
Spiral Computed Tomography ◽  
Three Dimensional Reconstruction ◽  
Resonance Imaging ◽  
Spiral Computed ◽  
Dimensional Reconstruction ◽  
Residual Capacity

Pettiaux, Nicolas, Marie Cassart, Manuel Paiva, and Marc Estenne. Three-dimensional reconstruction of human diaphragm with the use of spiral computed tomography. J. Appl. Physiol. 82(3): 998–1002, 1997.—We developed a technique of diaphragm imaging by using spiral computed tomography, and we studied four normal subjects who had been previously investigated with magnetic resonance imaging (A. P. Gauthier, S. Verbanck, M. Estenne, C. Segebarth, P. T. Macklem, and M. Paiva. J. Appl. Physiol. 76: 495–506, 1994). One acquisition of 15- to 25-s duration was performed at residual volume, functional residual capacity, functional residual capacity plus one-half inspiratory capacity, and total lung capacity with the subject holding his breath and relaxing. From these acquisitions, 20 coronal and 30 sagittal images were reconstructed at each lung volume; on each image, diaphragm contour in the zone of apposition and in the dome was digitized with the software Osiris, and the digitized silhouettes were used for three-dimensional reconstruction with Matlab. Values of length and surface area for the diaphragm, the dome, and the zone of apposition were very similar to those obtained with magnetic resonance imaging. We conclude that satisfactory three-dimensional reconstruction of the in vivo diaphragm may be obtained with spiral computed tomography, allowing accurate measurements of muscle length, surface area, and shape.

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.

scholarly journals Magnetic resonance urography in the evaluation of obstructive uropathy

2018 ◽  
Vol 8 (2) ◽  
pp. 91
Author(s):  
Mohd Ilyas ◽  
Irshad Ahmad ◽  
Insha Khan ◽  
Irfan Robbani ◽  
BaldevS Wazir
Keyword(s):  
Magnetic Resonance ◽  
Obstructive Uropathy ◽  
Magnetic Resonance Urography

Visualization of morphological details in congenitally malformed hearts: virtual three-dimensional reconstruction from magnetic resonance imaging

2003 ◽  
Vol 13 (5) ◽  
pp. 451-460 ◽  
Author(s):  
Thomas Sangild Sørensen ◽  
Erik Morre Pedersen ◽  
Ole Kromann Hansen ◽  
Keld Sørensen
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Real Time ◽  
Clinical Experience ◽  
Spatial Information ◽  
Three Dimensional ◽  
Three Dimensional Reconstruction ◽  
Resonance Imaging ◽  
Cardiac Malformations ◽  
Dimensional Reconstruction

In recent years, three-dimensional imaging has provided new opportunities for visualizing congenital cardiac malformations. We present the initial clinical experience using a recently implemented system, which employs some of new interactive, real-time, techniques. We show how three-dimensional rendering based on magnetic resonance imaging can provide detailed spatial information on both intrinsic and extrinsic cardiac relations, and hence how a virtual examination can potentially provide new means to a better understanding of complex congenital cardiac malformations.

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