Evaluation of RARE-MR Urography in the Assessment of Ureterohydronephrosis

Roy, Catherine; Saussine, C.; Jahn, Christine; Vinée, P; Beaujeux, R.; Campos, Marcelo Ferraz de; Gounot, Daniel; Chambron, J.

doi:10.1097/00004728-199407000-00018

Cited by 76 publications

(45 citation statements)

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“…MRU equals IVU for the diagnosis of utererohydronephrosis in patients with normal renal function with an accuracy of 100%, and there is no difference in the amount of dilatation between IVU and RMU. The analysis is similar to that of IVU [13,14] (Figs. 4, 5).…”

Section: Pathological Findingssupporting

confidence: 65%

MR urography in the evaluation of urinary tract obstruction

et al. 1998

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Section: Pathological Findingssupporting

confidence: 65%

MR urography in the evaluation of urinary tract obstruction

et al. 1998

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“…(6) When reviewing MR urographic images created with MIP or VR algorithms, one should always consult the original data (source images) to ensure that small filling defects are not obscured by surrounding high signal intensity urine.…”

Section: Discussionmentioning

confidence: 99%

“…[5,2,3,6,7,8,4] The most common MR urographic techniques for displaying the urinary tract can be divided into two categories: Static-fluid MR urography and Excretory MR urography. Static-fluid MR urography makes use of heavily T2-weighted sequences to image the urinary tract as a static collection of fluid, can be repeated sequentially (cine MR urography) to better demonstrate the ureters in their entirety and to confirm the presence of fixed stenosis, and is most successful in patients with dilated or obstructed collecting systems.…”

mentioning

confidence: 99%

MR Urography With Dynamic 3d Mip Aided Detection- Diagnostic Significance Value in Suspected Pelvicaliectasis Confirmation

Ameen¹,

Vetriraj²

2018

jemds

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BACKGROUND Hydronephrosis is the most common cause of chronic renal failure. Hydronephrosis due to calculus disease is more frequent than without non-calculus aetiology. Mild hydronephrosis or mild pelvicaliectasis is commonly encountered on routine ultrasound screening. Radiologist's bias in mild pelvicaliectasis as to rule out physiological or early pathology is our purpose of study. Role of MR Urography serve as a problem solving tool for ultrasound in mild pelvicaliectasis by specific protocol with 3D aided and dynamic imaging.The objective of this study is to evaluate efficacy of MR urography for suspecting hydronephrosis in asymptomatic and incidental detected hydronephrosis in other radiological modalities. MATERIALS AND METHODS34 patients were enrolled in descriptive study with institutional ethical review obtained. Clinically suspected pelvicaliectasis patients screened by Ultrasound were set as inclusion criteria. Pelvicaliectasis positive patients on ultrasound were subjected to MR urography and renal diuretic nuclear study. Remaining patients were set as control group and compared with the results. MR urography non-contrast protocol were deployed. The three dimensional sequence was used to track passage of contrast from kidneys to ureter and bladder. MR urography followed by furosemide scintigraphy was also done to compare the efficacy of MR urography, keeping as reference standard. Nuclear medicine furosemide renal study was done for all MR urography within 1 week duration. Renal functional test parameters like renal transit time and average contrast wash-out time are calculated, and in all the cases these parameters are depicted as characteristics of analysis curve. Bland-Altman plots were used to quantify intra-and interobserver performance. Statistical significance was derived by comparing both modality curves with a mean under the curve of 0.90. Percentage analysis was also done by comparing two modalities, sensitivity and specificity. RESULTS6 positive cases were noted from MR Urography from sample size (N= 19) with left UPJ obstruction (N= 1), right VUJ obstruction (N= 1), stricture in right mid ureter (n= 3) and left mid ureter (N= 1). Calculus obstruction patients were excluded from the study. All the cases and results were compared with diuretic renal scintigraphy. On the basis of interobserver performance on characteristic curves, results obtained were almost similar. RTT obstructed (RTT > 410 seconds) obtained from both characteristic curves with percentage analysis were with better sensitivity (98.8%) and specificity (100%). CONCLUSIONMR Urography proved to be the future gold standard for suspected mild pelvicaliectasis in our study. However, large cohort study needs to be addressed to prove efficacy in large sample volume.

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“…3-Dimensional respiratory triggered sequences can be used to obtain thin section data sets that can be post processed to create VR/MIP images of entire urinary tract. 9,10 FRFSE (Fast recovery fast spin echo) 11 provides high signal intensity of fluid even with short repetition time and can be used for short breath hold techniques or respiratory gating. After signal decay at end echo train, a negative 90 0 pulse align spins with T2 from transverse plane to longitudinal plane, leading to a much faster recovery of tissues with long T2 time to equilibrium and thus better contrast between tissues with long and short T2.…”

Section: Technique Of Mrumentioning

confidence: 99%

Non-Contrast Magnetic Resonance Urography- A Prospective Study

S¹,

M²,

Jayalatha³

2017

jemds

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BACKGROUNDThe key element, iodine set the stage for all future developments in contrast material for radiographic imaging. From this stage, extensive development of the quality of contrast medium has grown immensely to the present stage of non-ionic contrast media which are considered to be safe. The aims of this study are-1. To study the efficacy of static MR urography in comparison with conventional urography. 2. To study the levels and causes of obstruction of urinary tract by MR urography and compare them with other investigation procedures. MATERIALS AND METHODS120 patients who presented with clinical symptoms and signs pertaining to renal diseases and were positive on conventional MRI from Department of Radiodiagnosis, Osmania Medical College/ Hospital, Hyderabad, were selected for this study. This is an Institution-based cross-sectional study. MRU was performed on SIGNA HD 1.5 Tesla MRI, GE Healthcare (Milwaukee, USA). A body coil and commercially available software were used. SIGNA HD 1.5T is a diagnostic imaging device, which generates and displays transverse, sagittal, coronal and paraxial whole body images. Before performing MR urography, 3-plane localiser obtained in three planes was used to confirm optimum patient positioning; axial and coronal T2 weighted single shot FSE sequences of KUB region were taken, (TR 1615 msec, TE 88 msec, FOV 38 x 38, Matrix 256 x 256, NEX 0.56, TA 49 sec). The imaging method was based on the physical principle of magnetic resonance (MR). During the measurement, the patient was placed on the strong homogeneous magnetic field. The hydrogen nuclei (protons) distributed throughout the entire body tissue generate signals when stimulated by an RF field. These signals were processed into images by a computer. RESULTSIn our study, 3D respiratory triggered sequences 3D FR FSE (Fast Recovery Fast Spin Echo) sequence was used. It provides high signal intensity of fluid even with short repetition time. After signal decay at end of echo train, a negative 90 degree pulse align spins with long T2 from transverse plane to longitudinal plane leading to a much faster recovery of tissues with long T2 time to equilibrium and thus better contrast between tissues with long and short T2. A frequency-selective fat-saturation pulse was used to reduce signal from retroperitoneal fat. During a period of 3 years, a total of 120 patients formed the study group. This included 52 females (43%) and 68 males (57%). Most patients in this study group belonged to the 3 rd decade. Commonest complaint in this study was pain followed by dysuria. MR Urography images were of relatively good quality. Distension of urinary bladder aided in better visualisation of upper urinary tract. We had considerable difficulty in removal of overlying bowel from images of few patients. Renal sizes could be easily measured, renal contours were normal, no masses and other parenchymal abnormalities were seen. Calyceal, forniceal and infundibular anatomy was not seen with the same detail as with an IVU. Anatomy of retrop...

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Evaluation of RARE-MR Urography in the Assessment of Ureterohydronephrosis

Cited by 76 publications

References 0 publications

MR urography in the evaluation of urinary tract obstruction

MR urography in the evaluation of urinary tract obstruction

MR Urography With Dynamic 3d Mip Aided Detection- Diagnostic Significance Value in Suspected Pelvicaliectasis Confirmation

Non-Contrast Magnetic Resonance Urography- A Prospective Study

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