Mr cholangiopancreatography: Comparison between two-dimensional fast spin-echo and three-dimensional gradient-echo pulse sequences

1995 ◽  
Vol 5 (4) ◽  
pp. 379-384 ◽  
Author(s):  
Caroline Reinhold ◽  
Laurent Guibaud ◽  
Gilles Genin ◽  
Patrice M. Bret
Keyword(s):  
Spin Echo ◽  
Pulse Sequences ◽  
Three Dimensional ◽  
Fast Spin Echo ◽  
Two Dimensional ◽  
Gradient Echo ◽  
Mr Cholangiopancreatography ◽  
Echo Pulse ◽  
Fast Spin

Magnetic resonance imaging of hyaline cartilage defects at 1.5T and 3.0T: comparison of medium T2‐weighted fast spin echo, T1‐weighted two‐dimensional and three‐dimensional gradient echo pulse sequences

2005 ◽  
Vol 46 (1) ◽  
pp. 67-73 ◽  
Author(s):  
F. Fischbach ◽  
H. Bruhn ◽  
F. Unterhauser ◽  
J. Ricke ◽  
G. Wieners ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Hyaline Cartilage ◽  
Spin Echo ◽  
Three Dimensional ◽  
Fast Spin Echo ◽  
Two Dimensional ◽  
Gradient Echo ◽  
Lesion Detectability ◽  
Fast Spin ◽  
Field Strengths

Purpose: To evaluate and compare the diagnostic accuracy of appropriate magnetic resonance (MR) sequences in the detection of cartilage lesions at 1.5T and 3.0T. Material and Methods: Twelve chondral defects of varying depths, widths, and locations were created in the retropatellar hyaline cartilage in six sheep cadaver limbs. Axial images employing three fat‐suppressed imaging sequences – (1) a T2‐weighted fast spin‐echo (FSE) sequence, (2) a two‐dimensional (2D) and (3) three‐dimensional (3D) gradient‐echo (GE) sequence at 1.5T and 3.0T using an extremity quadrature coil – were evaluated by three experienced radiologists. Statistical analysis of the results consisted of receiver operating characteristics (ROC) and significant testing using the bivariate chi‐square test. In addition, signal‐to‐noise ratios (SNR) and contrast‐to‐noise ratios (CNR) were evaluated with significance testing using the Wilcoxon test. Results: The 3D GE sequence compared favorably with other sequences at 3.0T and 1.5T (Az = 0.88 at 3.0T and Az = 0.85 at 1.5T) missing only one small grade 2 lesion. 2D GE imaging was inferior to 3D imaging at both field strengths ( P<0.05) in general. However, compared to 1.5T, lesion detectability was improved at the higher magnetic field of 3.0T (Az = 0.81 and 0.73 at 3.0T and 1.5T, respectively). FSE images showed significantly inferior sensitivity and less anatomical detail compared to the GE sequences at both field strengths (Az = 0.64 and 0.72 at 3.0T and 1.5T, respectively; P<0.05). However, compared to 1.5T, lesion detectability SNR and CNR values were superior in all sequences tested at 3.0T. Conclusion: MRI at 3.0T improves SNR and CNR significantly in the most common sequences for cartilage MRI, resulting in an improvement in chondral lesion detection. GE imaging therefore allows resolution to be increased in an acceptable time manner for patient comfort, and the 3D GE fat‐suppressed sequence at 3.0T appears to be best suited for cartilage imaging in a clinical setting.

5281916 NMR angiography using fast spin echo pulse sequences

1995 ◽  
Vol 13 (1) ◽  
pp. IX
Author(s):  
Richard S Hinks ◽  
Matthew Bernstein
Keyword(s):  
Spin Echo ◽  
Pulse Sequences ◽  
Fast Spin Echo ◽  
Echo Pulse ◽  
Fast Spin

Comparison of breath-hold fast spin-echo and conventional spin-echo pulse sequences for T2-weighted MR imaging of liver lesions.

Radiology ◽  
1995 ◽  
Vol 194 (2) ◽  
pp. 431-437 ◽  
Author(s):  
J N Rydberg ◽  
D J Lomas ◽  
K J Coakley ◽  
D M Hough ◽  
R L Ehman ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Spin Echo ◽  
Pulse Sequences ◽  
Fast Spin Echo ◽  
Breath Hold ◽  
Liver Lesions ◽  
Echo Pulse ◽  
Conventional Spin Echo ◽  
Fast Spin

Improvement of MR cholangiopancreatography at .5 T: Three-dimensional half-averaged single-shot fast spin echo with multi-breath-hold technique

1998 ◽  
Vol 8 (2) ◽  
pp. 459-466 ◽  
Author(s):  
Tomoaki Ichikawa ◽  
Hiroki Haradome ◽  
Hideto Hanaoka ◽  
Yosimori Kassai ◽  
Toshiaki Nitatori ◽  
...  
Keyword(s):  
Spin Echo ◽  
Three Dimensional ◽  
Fast Spin Echo ◽  
Breath Hold ◽  
Single Shot ◽  
Mr Cholangiopancreatography ◽  
Fast Spin

Superparamagnetic Iron Oxide Hepatic MR Imaging: Efficacy and Safety Using Conventional and Fast Spin-Echo Pulse Sequences

1995 ◽  
Vol 5 (5) ◽  
pp. 566-570 ◽  
Author(s):  
Lawrence H. Schwartz ◽  
Steven E. Seltzer ◽  
Clare M. C. Tempany ◽  
Stuart G. Silverman ◽  
David R. Piwnica-Worms ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Mr Imaging ◽  
Spin Echo ◽  
Pulse Sequences ◽  
Superparamagnetic Iron Oxide ◽  
Fast Spin Echo ◽  
Efficacy And Safety ◽  
Echo Pulse ◽  
Fast Spin

Diagnosis of acetabular labral tears: Comparison of three-dimensional intermediate-weighted fast spin-echo MR arthrography with two-dimensional MR arthrography at 3.0 T

2013 ◽  
Vol 54 (1) ◽  
pp. 75-82 ◽  
Author(s):  
So Young Park ◽  
Ji Seon Park ◽  
Wook Jin ◽  
Kee Hyung Rhyu ◽  
Kyung Nam Ryu
Keyword(s):  
Spin Echo ◽  
Mr Arthrography ◽  
Three Dimensional ◽  
Observer Agreement ◽  
Fast Spin Echo ◽  
Two Dimensional ◽  
Observer Reliability ◽  
Labral Tears ◽  
Arthroscopic Findings ◽  
Fast Spin

Background Magnetic resonance (MR) arthrography is the ideal imaging modality for the acetabular labrum. Three-dimensional (3D) fast spin-echo (FSE) sequences have similar diagnostic performance as two-dimensional (2D) conventional MR imaging for ligaments, menisci, or bone marrow edema in the knee. Purpose To compare the diagnostic accuracy and inter-observer reliability of 3D intermediate-weighted FSE sequence and 2D FSE sequences for the diagnosis of acetabular labral tears. Material and Methods Institutional review board approval was obtained and informed consent was waived for 45 patients (47 hips) who underwent 3D and 2D MR arthrography and subsequent arthroscopic surgery. The 3D sequences were performed using volumetric intermediate-weighted fast spin-echo imaging with fat suppression (voxel size, 0.6 × 0.6 × 1.2 mm; imaging time, 6 min 38 s). Labral tear was retrospectively and independently evaluated by two radiologists in four areas of the labrum (anterosuperior, posterosuperior, anteroinferior, and posteroinferior) on 3D and 2D FSE sequences. Statistical differences between the sensitivity and specificity of the methods were analyzed with the McNemar test, using arthroscopic findings as the reference standard. Inter-observer agreement was calculated using kappa statistics. Results Arthroscopic findings confirmed labral tears at 40 anterosuperior, 23 posterosuperior, 0 anteroinferior, and 2 posteroinferior quadrants. Sensitivity and specificity were 74% and 89% for 2D FSE sequences, and 78% and 92% for 3D FSE sequences, respectively. Sensitivities and specificities for the methods were not different statistically (P > 0.05). Inter-observer agreement for labral tear was substantial for 2D FSE sequences (k = 0.774) and almost perfect for 3D FSE sequences (k = 0.842). Conclusion 3D intermediate-weighted FSE MR arthrography is excellent for diagnosing acetabular labral tears. Sensitivity, specificity, and inter-observer reliability were similar to conventional 2D MR arthrography. For evaluation of the labrum, 3D FSE MR arthrography is more time-efficient than 2D FSE MR arthrography.

Sign in / Sign up

Export Citation Format

Share Document