ISSN: 1899-0967
Polish Journal of Radiology
Established by prof. Zygmunt Grudziński in 1926 Sun
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1/2022
vol. 87
 
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Head and neck radiology
abstract:
Original paper

Intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) of the major salivary glands: an assessment of the optimal number and combination of b-values

Mitsuhiro Kimura
1
,
Hidetake Yabuuchi
1
,
Hiroshi Narita
2
,
Yoichi Kurihara
3
,
Kiyoshi Hisada
3
,
Noriyuki Sakai
1
,
Kazuya Nagatomo
1
,
Ryoji Mikayama
1
,
Masafumi Masaki
3
,
Hiroshi Kimura
4

1.
Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
2.
Hitachi, Ltd., Tokyo, Japan
3.
Department of Radiology, Kimura Hospital, Fukuoka, Japan
4.
Department of Surgery, Kimura Hospital, Fukuoka, Japan
Pol J Radiol 2022; 87: e246-e256
Online publish date: 2022/05/06
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Purpose
To examine the optimal number and combination of b-values in intravoxel incoherent motion (IVIM) diffusion-weighted imaging (DWI) of the major salivary glands.

Material and methods
IVIM-DWI was performed on 10 healthy volunteers using 13 b-values (low b-values: 0-100 s/mm2; high b-values: 200-1000 s/mm2). The IVIM parameters and apparent diffusion coefficient of the bilateral major salivary glands were calculated using 13 b-values and were considered the standard values. We sequentially reduced the number of b-values to 10, 8, 6, and 5. The parameters in each combination were calculated. The standard values were compared with the parameters from each reduced b-value in IVIM-DWI. The Wilcoxon signed-rank test was used to determine whether there were any differences between the parameters in each combination. Bonferroni correction was conducted for multiple comparisons.

Results
There were no significant differences between the standard values and parameters from the 2 combinations of 6 b-values. However, significant differences were observed between the standard values and parameters from some combinations of only 2 low or only 2 high b-values.

Conclusions
IVIM-DWI of the major salivary glands could be performed using a minimum of 6 b-values. However, they should contain 3 low and 3 high b-values.

keywords:

salivary glands, magnetic resonance imaging, diffusion, perfusion, quantitative evaluation




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