Time‐resolved dynamic contrast‐enhanced MR urography for the evaluation of ureteral peristalsis: Initial experience

Kim, Sooah; Jacob, Jason S.; Kim, Danny; Rivera, Rafael; Lim, Ruth; Lee, Vivian S.

doi:10.1002/jmri.21567

Cited by 14 publications

(10 citation statements)

References 17 publications

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“…[55] Time-resolved dynamic contrast-enhanced MRU has been used in the evaluation of ureteral peristalsis in GUTB. [56] In view of the possibility of nephrogenic systemic fibrosis/nephrogenic fibrosing dermopathy,[57] caution should be exercised while administering gadolinium in patients with compromised renal function.…”

Section: Magnetic Resonance Imagingmentioning

confidence: 99%

Tuberculosis of the genitourinary system-Urinary tract tuberculosis: Renal tuberculosis-Part II

Merchant

Bharati

Merchant

2013

Indian J Radiol Imaging

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This article reviews the computed tomography and magnetic resonance imaging (MRI) features of renal tuberculosis (TB), including TB in transplant recipients and immunocompromised patients. Multi detector computed tomography (MDCT) forms the mainstay of cross-sectional imaging in renal TB. It can easily identify calcification, renal scars, mass lesions, and urothelial thickening. The combination of uneven caliectasis, with urothelial thickening and lack of pelvic dilatation, can also be demonstrated on MDCT. MRI is a sensitive modality for demonstration of features of renal TB, including tissue edema, asymmetric perinephric fat stranding, and thickening of Gerota's fascia, all of which may be clues to focal pyelonephritis of tuberculous origin. Diffusion-weighted MR imaging with apparent diffusion coefficient (ADC) values may help in differentiating hydronephrosis from pyonephrosis. ADC values also have the potential to serve as a sensitive non-invasive biomarker of renal fibrosis. Immunocompromised patients are at increased risk of renal TB. In transplant patients, renal TB, including tuberculous interstitial nephritis, is an important cause of graft dysfunction. Renal TB in patients with HIV more often shows greater parenchymal affection, with poorly formed granulomas and relatively less frequent findings of caseation and stenosis. Atypical mycobacterial infections are also more common in immunocompromised patients.

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Section: Magnetic Resonance Imagingmentioning

confidence: 99%

Tuberculosis of the genitourinary system-Urinary tract tuberculosis: Renal tuberculosis-Part II

Merchant

Bharati

Merchant

2013

Indian J Radiol Imaging

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“…However, in the patient data set x-plane duplication was limited to the ureter; this implied that either the movement was not in this axis or that there was isolated movement of the ureter. Frequency of peristalsis is variable, recent dynamic studies quote a mean frequency of 3.5 waves per min [7]. The time taken to acquire a full IVP data set is 5.4 s, it is therefore possible that peristalsis occurred during acquisition; however, this is more likely to result in a contracted ureter in several of the raw projection images as the peristaltic wave propagates the fluid bolus rather than a lateral translation of the ureter.…”

Section: X-axis Translationmentioning

confidence: 91%

Intravenous pyelogram artefacts unique to digital tomosynthesis reconstruction

Rowberry

Galea²

2011

BJR

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ABSTRACT. Recent advances in technology have led to the realisation of digital tomosynthesis (DT) imaging in routine investigations such as intravenous pyelogram (IVP). The major advantage this technology has over other technologies is its ability to perform a retrospective reconstruction of an arbitrary number of coronal image planes from a single data set consisting of a series of low dose discrete projections acquired over a limited angular range using a stationary detector. It is well documented that because DT relies on an angular limited acquisition, the data set is incomplete. This, in combination with the image reconstruction algorithm, results in reconstructed images containing non-focused information from outside the immediate focal plane. This article describes and suggests the cause of two artefacts unique to DT that cannot be explained by blurring alone. We believe the two artefacts are caused by breathing during data acquisition together with a combination of other factors, including the anatomy of the renal system, the method of data acquisition and the reconstructive algorithm used. This could lead to the unaware reporting radiologist falsely diagnosing a duplex collecting system. To avoid these artefacts, we recommend DT IVP should only be used in patients who can adequately perform a breath-hold for the duration of the data acquisition. In addition, we suggest that the study should be performed with breath-held following expiration. Tomosynthesis relies on a series of two-dimensional (2D) radiographs acquired at varying angles to the object of interest. A coronal image plane may then be reconstructed from the 2D data by spatially translating each 2D image and superimposing each radiograph to an arbitrary reference. The magnitude of the translation of the 2D radiograph determines the height of the reconstructed coronal image plane. This relies on the fact that all objects at a particular height will suffer the same amount of parallax, while objects outside the plane of interest suffer varying degrees of parallax and contribute only noise to the image. This noise evidences itself as a series of discrete blurred versions of objects from out-ofplane structures, repeated at regular spatial intervals along the y-axis. The degree of blurring increases the further away from the plane of interest the object is. Furthermore, the magnitude and spread of these artefacts has been quantified using the artefact spread function (ASF) [1]. Much of the reported work has been in the attempt to reduce these artefacts with varying degrees of success. For example, Chekraborty et al [2], Van der Stelt et al [3], Lui et al [4] and Sone et al [5] in 1996 used high pass filters, and Sone et al [6] in 1991 used band pass filters to refine the resultant image.For the sake of the article we will assume that the xaxis is a horizontal line on an anteroposterior (AP) radiograph and the z-axis is a vertical line, i.e. perpendicular and parallel to the spine, respectively. The y-axis is the depth in or out of the plane of the A...

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“…They are based on ultrasound, X-ray, isotopic, and magnetic resonance examinations yielding information on UUT size and structure, and on stone or stricture location (Kinn, 1996). The qualitative data on ureteral function given by visualization techniques is UUT dilation, and an indication on peristaltic frequency (Kim et al, 2008).…”

Section: Methods Of the Uut Urodynamic Functional Diagnosticsmentioning

confidence: 99%

“…Virtually the same data were reported for human ureter obtained by intraluminal ureteric pressure measurements: the peristalsis rate and conduction velocity respectively ranged 0-4.1 min -1 and 1.5-2.6 cm/s (Davenport et al, 2007). Visualization technique yielded only the data for peristaltic rate 3.5 min -1 in normal ureters, while the abnormal ureters were characterized with decreased or absent peristalsis (Kim et al, 2008).…”

Section: Peculiarities Of the Ureteral Function In Patients With Varimentioning

confidence: 99%

Ureteric Function and Upper Urinary Tract Urodynamics in Patients with Stones in Kidney and Ureter

Irina¹,

Lubov²

2012

Evolving Trends in Urology

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Time‐resolved dynamic contrast‐enhanced MR urography for the evaluation of ureteral peristalsis: Initial experience

Cited by 14 publications

References 17 publications

Tuberculosis of the genitourinary system-Urinary tract tuberculosis: Renal tuberculosis-Part II

Tuberculosis of the genitourinary system-Urinary tract tuberculosis: Renal tuberculosis-Part II

Intravenous pyelogram artefacts unique to digital tomosynthesis reconstruction

Ureteric Function and Upper Urinary Tract Urodynamics in Patients with Stones in Kidney and Ureter

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