TY - JOUR
T1 - Evaluation of pulse sequences used for magnetic resonance sialography
AU - Sakamoto, Maya
AU - Sasano, Takashi
AU - Higano, S.
AU - Takahashi, Syouki
AU - Nagasaka, T.
AU - Yanagawa, I.
AU - Hosogai, Y.
AU - Tamura, H.
AU - Iikubo, M.
AU - Shoji, N.
PY - 2001
Y1 - 2001
N2 - Objectives: To determine the most appropriate sequences for the visualization of small parotid ducts in MR sialography. Methods: MR images of a phantom consisting of distilled water in polyethylene tubes were obtained with turbo-spin echo (TSE), single-shot turbo-spin echo (SSTSE), half-fourier acquisition, single-shot turbo-spin echo (HASTE) and turbo gradient-spin echo (TGSE) pulse sequences and compared visually and quantitatively. MR sialograms obtained from healthy volunteers and patients with Sjögren's syndrome (SS) were obtained using the same four sequences. Results: In the phantom, TSE images were best and the contrast-noise ratio (CNR) highest. In the volunteers, the main ducts were especially clearly visualized with TSE and in SSTSE; however, the majority of secondary and/or tertiary parotid ducts were not depicted by any of the sequences used. In SS patients, images of small main ducts and small pseudocysts were clearer using TSE. However, TSE could not depict the narrow main ducts or peripheral ducts or very small pseudocysts. Conclusions: TSE is considered the most suitable MR sequence for assessing small parotid gland ducts. However, further improvement is needed since it does not always visualize them sufficiently.
AB - Objectives: To determine the most appropriate sequences for the visualization of small parotid ducts in MR sialography. Methods: MR images of a phantom consisting of distilled water in polyethylene tubes were obtained with turbo-spin echo (TSE), single-shot turbo-spin echo (SSTSE), half-fourier acquisition, single-shot turbo-spin echo (HASTE) and turbo gradient-spin echo (TGSE) pulse sequences and compared visually and quantitatively. MR sialograms obtained from healthy volunteers and patients with Sjögren's syndrome (SS) were obtained using the same four sequences. Results: In the phantom, TSE images were best and the contrast-noise ratio (CNR) highest. In the volunteers, the main ducts were especially clearly visualized with TSE and in SSTSE; however, the majority of secondary and/or tertiary parotid ducts were not depicted by any of the sequences used. In SS patients, images of small main ducts and small pseudocysts were clearer using TSE. However, TSE could not depict the narrow main ducts or peripheral ducts or very small pseudocysts. Conclusions: TSE is considered the most suitable MR sequence for assessing small parotid gland ducts. However, further improvement is needed since it does not always visualize them sufficiently.
KW - Magnetic resonance imaging
KW - Salivary gland diseases
KW - Sialography
KW - Sjögren-Larsson syndrome
UR - http://www.scopus.com/inward/record.url?scp=18044399791&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18044399791&partnerID=8YFLogxK
U2 - 10.1038/sj.dmfr.4600632
DO - 10.1038/sj.dmfr.4600632
M3 - Article
C2 - 11571548
AN - SCOPUS:18044399791
VL - 30
SP - 276
EP - 284
JO - Dentomaxillofacial Radiology
JF - Dentomaxillofacial Radiology
SN - 0250-832X
IS - 5
ER -