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Optimization of a double inversion recovery sequence for noninvasive synovium imaging of joint effusion in the knee
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10.1118/1.3581060
/content/aapm/journal/medphys/38/5/10.1118/1.3581060
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/5/10.1118/1.3581060
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Figures

Image of FIG. 1.
FIG. 1.

An example of the effusion regions of a knee. Effusion regions shown on T2-weighted images (A), peripheral enhancement of the contrast-enhanced MR images (B), and a schematic drawing of the effusion areas (C). The effusion region contained two separate areas which included fluid in the inner portions (dark arrow) and synovium at the periphery (white arrow).

Image of FIG. 2.
FIG. 2.

A schematic drawing of the double inversion recovery sequence. The two inversion times are denoted as TI 1 and TI 2. τ is a constant value that is equal to half of the echo spacing. Imaging acquisition was performed with a turbo spin-echo acquisition mode (TSE Acq).

Image of FIG. 3.
FIG. 3.

Results of the computer simulations to suppress signals from both water and fat based on T 1 relaxation times. The normalized values of the available magnetization Mz versus the T 1 values for the TI 1 and TI 2 values that are appropriate for nulling fluid, and fat signal with a given TR, TE, and τ are plotted in this figure.

Image of FIG. 4.
FIG. 4.

DIR images with different double-inversion times obtained from a 28-year-old male patient without using a fat suppression pulse that demonstrate the improved effusion contrast. IMW is the intermediate density-weighted turbo spin-echo image without using a fat suppression pulse. DIR is the double inversion recovery images obtained with 254-2830 ms. The scan time was 2 min and 20 s for the DIR sequence.

Image of FIG. 5.
FIG. 5.

Improved effusion contrast with the DIR sequence in images obtained from a 48-year-old female patient. The images were acquired with using a fat suppression pulse for two imaging sequences. IMW is the intermediate density-weighted turbo spin-echo image without using a fat suppression pulse. DIR is the double inversion recovery images obtained with 254-2830 ms. The scan time was 2 min and 20 s for the DIR sequence.

Image of FIG. 6.
FIG. 6.

Comparisons of the DIR images with fat-saturated contrast-enhanced T1-weighted (CE T1W) images obtained from a 69-year-old female patient that demonstrate the usefulness of the DIR sequences for imaging the effusion areas. IMW is the intermediate density-weighted turbo spin-echo image. DIR images were obtained with TI 1 = 2830 ms and TI 2 = 254 ms. The enhanced areas from the CE T1W are overlaid onto the IMW and DIR images.

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/content/aapm/journal/medphys/38/5/10.1118/1.3581060
2011-05-05
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optimization of a double inversion recovery sequence for noninvasive synovium imaging of joint effusion in the knee
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/5/10.1118/1.3581060
10.1118/1.3581060
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