Abstract
To improve spatial resolution of renal magnetic resonance (MR) angiography, we attempted to use MR signals before reaching steady state in balanced turbo field echo (b-TFE) sequence. An isotropic protocol (isotropic voxel size; 0.78 mm) was constructed, but the loss of contrast to noise ratio (CNR) was not avoided though we employed the dedicated k-space scheme. The trade-off of the spatial resolution and CNR is difficult to decide by numerical value only, and it is necessary to introduce evaluation of clinical images for the determination of a flip angle. In this study, we investigated the optimal combination of voxel size and flip angle using visual evaluation in order to obtain a good balance of the spatial resolution and CNR. A paired comparison method was employed as visual evaluation. As a result, the highest scale-value of available combination of isotropic voxel size and flip angle was 0.67 mm and 60 degrees. This isotropic protocol of the highest resolution for MR angiography of renal arteries using contrast behavior during the transient phase of b-TFE sequence will be useful in the clinical field.
| Original language | English |
|---|---|
| Title of host publication | IFMBE Proceedings |
| Pages | 364-367 |
| Number of pages | 4 |
| Volume | 25 |
| Edition | 2 |
| DOIs | |
| Publication status | Published - 2009 |
| Event | World Congress on Medical Physics and Biomedical Engineering: Diagnostic Imaging - Munich, Germany Duration: Sep 7 2009 → Sep 12 2009 |
Other
| Other | World Congress on Medical Physics and Biomedical Engineering: Diagnostic Imaging |
|---|---|
| Country | Germany |
| City | Munich |
| Period | 9/7/09 → 9/12/09 |
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Keywords
- Isotropic protocol
- Paired comparison method
- Renal MR angiography
- Spatial resolution
- Transient phase
ASJC Scopus subject areas
- Biomedical Engineering
- Bioengineering
Cite this
Optimization of combination of voxel size and flip angle by visual evaluation for renal magnetic resonance angiography without a contrast agent. / Kida, K.; Goto, Sachiko; Azuma, Y.
IFMBE Proceedings. Vol. 25 2. ed. 2009. p. 364-367.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Optimization of combination of voxel size and flip angle by visual evaluation for renal magnetic resonance angiography without a contrast agent
AU - Kida, K.
AU - Goto, Sachiko
AU - Azuma, Y.
PY - 2009
Y1 - 2009
N2 - To improve spatial resolution of renal magnetic resonance (MR) angiography, we attempted to use MR signals before reaching steady state in balanced turbo field echo (b-TFE) sequence. An isotropic protocol (isotropic voxel size; 0.78 mm) was constructed, but the loss of contrast to noise ratio (CNR) was not avoided though we employed the dedicated k-space scheme. The trade-off of the spatial resolution and CNR is difficult to decide by numerical value only, and it is necessary to introduce evaluation of clinical images for the determination of a flip angle. In this study, we investigated the optimal combination of voxel size and flip angle using visual evaluation in order to obtain a good balance of the spatial resolution and CNR. A paired comparison method was employed as visual evaluation. As a result, the highest scale-value of available combination of isotropic voxel size and flip angle was 0.67 mm and 60 degrees. This isotropic protocol of the highest resolution for MR angiography of renal arteries using contrast behavior during the transient phase of b-TFE sequence will be useful in the clinical field.
AB - To improve spatial resolution of renal magnetic resonance (MR) angiography, we attempted to use MR signals before reaching steady state in balanced turbo field echo (b-TFE) sequence. An isotropic protocol (isotropic voxel size; 0.78 mm) was constructed, but the loss of contrast to noise ratio (CNR) was not avoided though we employed the dedicated k-space scheme. The trade-off of the spatial resolution and CNR is difficult to decide by numerical value only, and it is necessary to introduce evaluation of clinical images for the determination of a flip angle. In this study, we investigated the optimal combination of voxel size and flip angle using visual evaluation in order to obtain a good balance of the spatial resolution and CNR. A paired comparison method was employed as visual evaluation. As a result, the highest scale-value of available combination of isotropic voxel size and flip angle was 0.67 mm and 60 degrees. This isotropic protocol of the highest resolution for MR angiography of renal arteries using contrast behavior during the transient phase of b-TFE sequence will be useful in the clinical field.
KW - Isotropic protocol
KW - Paired comparison method
KW - Renal MR angiography
KW - Spatial resolution
KW - Transient phase
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U2 - 10.1007/978-3-642-03879-2-103
DO - 10.1007/978-3-642-03879-2-103
M3 - Conference contribution
AN - SCOPUS:77950870480
SN - 9783642038785
VL - 25
SP - 364
EP - 367
BT - IFMBE Proceedings
ER -