Nonenhanced ECG-gated quiescent-interval single-shot MRA (QISS-MRA) of the lower extremities: Comparison with contrast-enhanced MRA

2012 ◽  
Vol 67 (5) ◽  
pp. 441-446 ◽  
Author(s):  
J. Klasen ◽  
D. Blondin ◽  
P. Schmitt ◽  
X. Bi ◽  
R. Sansone ◽  
...  
Keyword(s):  
Lower Extremities ◽  
Single Shot ◽  
Contrast Enhanced

Re: ECG-gated quiescent-interval single-shot MR angiography of the lower extremities: Initial experience at 3 T

2014 ◽  
Vol 69 (10) ◽  
pp. 1092
Author(s):  
M.S. Menzilcioglu ◽  
M. Duymus ◽  
S. Avcu ◽  
F. Ozkan ◽  
S. Yildiz
Keyword(s):  
Mr Angiography ◽  
Lower Extremities ◽  
Single Shot ◽  
Initial Experience

scholarly journals Quiescent-Interval Single-Shot Magnetic Resonance Angiography

Diagnostics ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 84
Author(s):  
Aman Saini ◽  
Alex Wallace ◽  
Hassan Albadawi ◽  
Sailendra Naidu ◽  
Sadeer Alzubaidi ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Image Quality ◽  
Magnetic Resonance Angiography ◽  
Diagnostic Imaging ◽  
Imaging Techniques ◽  
Feasibility Studies ◽  
Subsequent Treatment ◽  
Single Shot ◽  
Contrast Enhanced ◽  
Diagnostic Imaging Techniques

Lower extremity peripheral arterial disease (PAD) is a chronic, debilitating disease with a significant global burden. A number of diagnostic imaging techniques exist, including computed tomography angiography (CTA) and contrast-enhanced magnetic resonance angiography (CEMRA), to aid in PAD diagnosis and subsequent treatment planning. Due to concerns of renal toxicity or nephrogenic systemic fibrosis (NSF) for iodinated and gadolinium-based contrasts, respectively, a number of non-enhanced MRA (NEMRA) protocols are being increasingly used in PAD diagnosis. These techniques, including time of flight and phase contrast MRA, have previously demonstrated poor image quality, long acquisition times, and/or susceptibility to artifacts when compared to existing contrast-enhanced techniques. In recent years, Quiescent-Interval Single-Shot (QISS) MRA has been developed to overcome these limitations in NEMRA methods, with promising results. Here, we review the various screening and diagnostic tests currently used for PAD. The various NEMRA protocols are discussed, followed by a comprehensive review of the literature on QISS MRA to date. A particular emphasis is placed on QISS MRA feasibility studies and studies comparing the diagnostic accuracy and image quality of QISS MRA versus other diagnostic imaging techniques in PAD.

Prognostic significance of early changes in the apparent diffusion coefficient that occurs after treatment of patients with glioblastoma multiforme with bevacizumab

2009 ◽  
Vol 27 (15_suppl) ◽  
pp. 2058-2058
Author(s):  
M. Paldino ◽  
A. Desjardins ◽  
H. S. Friedman ◽  
J. J. Vredenburgh ◽  
D. P. Barboriak
Keyword(s):  
Diffusion Coefficient ◽  
Glioblastoma Multiforme ◽  
Mr Imaging ◽  
Apparent Diffusion Coefficient ◽  
Diffusion Tensor ◽  
Prognostic Significance ◽  
Single Shot ◽  
Signal Abnormality ◽  
Contrast Enhanced ◽  
Apparent Diffusion

2058 Background: To determine the prognostic significance of changes in parameters derived from diffusion tensor imaging (DTI) that occur in response to combination chemotherapy with the antiangiogenesis agent bevacizumab (BEV) in patients with recurrent glioblastoma multiforme (GBM). Methods: 16 patients (10 men, 6 women; age range 38–62 years) with recurrent GBM underwent serial 1.5T MR imaging. Axial single-shot echo planar DTI (TR/TE 6000/100; flip angle 90 degrees; voxel: 1.72 x 1.72 x 5mm; b value of 1000 sec/mm2; 12 directions) was obtained on scans performed 3 days and 1 day prior to and 1 day after initiation of therapy with BEV and irinotecan (CPT-11). Clinical follow-up and survival status was documented up to 20 months after the date of initial MR imaging. Apparent diffusion coefficient (ADC) and fractional anisotropy (FA) maps were aligned to whole brain contrast-enhanced 3D FLASH and 3D FLAIR image volumes (1 mm isotropic voxels) using a rigid body normalized mutual information algorithm. Based on two pre-treatment scans, the 95% confidence limits for change (95%CL) in ADC and FA were calculated in volumes of tumor-related contrast-enhancement (TRE) and FLAIR signal abnormality (FSA). A patient was considered to have a change in FA or ADC after therapy if the difference between the pre- and post-treatment values was greater than the 95% CL for that parameter. Progression was defined on contrast-enhanced MRI using MacDonald criteria by neuro-oncologists blinded to the DTI findings. Survival was compared using the log rank test. Results: DTI detected a change in ADC within FSA after therapy in three patients (2 increased, 1 decreased). Patients with a change in ADC within FSA had significantly shorter overall (p < 0.0012) and progression free (p < 0.015) survival than those with no change. Median survival in the patient group with a change in ADC was 24.7 (95% CI [17.3, 39.4]) weeks and 56.4 (95% CI [41.7, 96]) weeks in those patients with no change. Conclusions: In patients with GBM treated with BEV and CPT-11, a change in ADC after therapy in areas of FSA is associated with decreased survival. Parameters derived from DTI may, therefore, potentially serve as early markers of treatment failure in patients with GBM. [Table: see text]

scholarly journals Propagation-based imaging phase-contrast enhanced imaging setup for single shot acquisition using laser-generated X-ray sources

2019 ◽  
Vol 14 (03) ◽  
pp. C03005-C03005 ◽  
Author(s):  
F. Barbato ◽  
D. Batani ◽  
D. Mancelli ◽  
J. Trela ◽  
G. Zeraouli ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Single Shot ◽  
X Ray ◽  
Contrast Enhanced ◽  
Enhanced Imaging ◽  
Imaging Setup

scholarly journals Novel Diagnostic Options without Contrast Media or Radiation: Triggered Angiography Non-Contrast-Enhanced Sequence Magnetic Resonance Imaging in Treating Different Leg Venous Diseases

Diagnostics ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 355 ◽  
Author(s):  
Chien-Wei Chen ◽  
Yuan-Hsi Tseng ◽  
Chien-Chiao Lin ◽  
Chih-Chen Kao ◽  
Min Yi Wong ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Venous Thrombosis ◽  
Varicose Veins ◽  
Vascular Diseases ◽  
Lower Extremities ◽  
Venous Ulcer ◽  
Resonance Imaging ◽  
Contrast Enhanced ◽  
Venous Diseases

Objectives: Venous diseases in the lower extremities long lacked an objective diagnostic tool prior to the advent of the triggered angiography non-contrast-enhanced (TRANCE) technique. Methods: An observational study with retrospective data analysis. Materials: Between April 2017 and June 2019, 66 patients were evaluated for venous diseases through TRANCE-magnetic resonance imaging (MRI) and were grouped according to whether they had occlusive venous (OV) disease, a static venous ulcer (SU), or symptomatic varicose veins (VV). The clinical appliance of TRANCE-MRI was analysed by groups. Results: In total, 63 patients completed the study. TRANCE-MRI could identify venous thrombosis, including that of the abdominal and pelvic vessels, and it enabled the timely treatment of underlying diseases in patients with OV disease. TRANCE-MRI was statistically compared with the duplex scan, the gold standard to exclude deep vein thrombosis (DVT) in the legs, with regard to their abilities to detect venous thrombosis by using Cohen’s kappa coefficient at a compatible value of 0.711. It could provide the occlusion degree of the peripheral artery for treating an SU. Finally, TRANCE-MRI can be used to outline all collateral veins and occult thrombi before treating symptomatic or recurrent VV to ensure a perfect surgical plan and to avoid complications. Conclusions: TRANCE-MRI is an innovative tool in the treatment of versatile venous pathology in the lower extremities and is widely used for vascular diseases in our institution.

scholarly journals Contrast-Enhanced Magnetic Resonance Cholangiography: Practical Tips and Clinical Indications for Biliary Disease Management

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Stefano Palmucci ◽  
Federica Roccasalva ◽  
Marina Piccoli ◽  
Giovanni Fuccio Sanzà ◽  
Pietro Valerio Foti ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Spin Echo ◽  
Biliary Tree ◽  
Magnetic Resonance Cholangiography ◽  
Fast Spin Echo ◽  
Single Shot ◽  
Biliary Disease ◽  
Thin Sections ◽  
Contrast Enhanced ◽  
Fast Spin

Since its introduction, MRCP has been improved over the years due to the introduction of several technical advances and innovations. It consists of a noninvasive method for biliary tree representation, based on heavily T2-weighted images. Conventionally, its protocol includes two-dimensional single-shot fast spin-echo images, acquired with thin sections or with multiple thick slabs. In recent years, three-dimensional T2-weighted fast-recovery fast spin-echo images have been added to the conventional protocol, increasing the possibility of biliary anatomy demonstration and leading to a significant benefit over conventional 2D imaging. A significant innovation has been reached with the introduction of hepatobiliary contrasts, represented by gadoxetic acid and gadobenate dimeglumine: they are excreted into the bile canaliculi, allowing the opacification of the biliary tree. Recently, 3D interpolated T1-weighted spoiled gradient echo images have been proposed for the evaluation of the biliary tree, obtaining images after hepatobiliary contrast agent administration. Thus, the acquisition of these excretory phases improves the diagnostic capability of conventional MRCP—based on T2 acquisitions. In this paper, technical features of contrast-enhanced magnetic resonance cholangiography are briefly discussed; main diagnostic tips of hepatobiliary phase are showed, emphasizing the benefit of enhanced cholangiography in comparison with conventional MRCP.

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