Effect of Two Different 1.5T MRI Scanners on the Apparent Diffusion Coefifcient Measurement and its Reproducibility in Diffusion Weighted Imaging of the Liver
10.3969/j.issn.1005-5185.2013.12.010
- VernacularTitle:两种1.5T MRI仪对肝扩散加权成像表观扩散系数及可重复性的影响
- Author:
Shilin CHEN
;
Xin CHEN
;
Lishan ZHONG
;
Zaiyi LIU
;
Changhong LIANG
- Publication Type:Journal Article
- Keywords:
Liver;
Diffusion magnetic resonance imaging;
Diffusion weighted imaging;
Apparent diffusion coefficient;
Reproducibility of results
- From:
Chinese Journal of Medical Imaging
2013;(12):916-919
- CountryChina
- Language:Chinese
-
Abstract:
Purpose To investigate the effect of two different 1.5T MRI scanners on the apparent diffusion coefficient (ADC) measurement and its reproducibility in diffusion weighted imaging (DWI) of the liver. Materials and Methods Two groups of volunteers (33 people in each group) underwent liver DWI examination twice by using the same DWI sequence with b value of 0 and 800 s/mm2 on different MRI scanners (1.5T Siemens Espree and 1.5T Philips Achieva). On ADC maps, two region of interests were placed on three central slices of the left and right liver lobes, respectively. The ADC measurements of six region of interests on left and right liver lobes were averaged to represent the mean ADC values of the left and right liver lobe, respectively. The reproducibility of the ADC measurements was assessed by Bland-Altman method. Results The ADC values of the left and right liver lobes measured on Siemens MRI scanner were significantly higher than those on Philips MRI scanner (t=2.045-2.713, P<0.05); on both scanners, the ADC values of the left liver lobe were significantly higher than those of the right liver lobe (t=-10.561--7.263, P<0.001). The Bland-Altman results showed that the reproducibility of ADC measurement was similar on both MRI scanners, and both displayed higher reproducibility of right liver lobe than that of left liver lobe (on Siemens MRI scanner: the agreement were 16.65% and 7.55% for the left and right liver lobe, respectively;and on Philips MRI scanner:16.30%and 7.85%, respectively. Conclusion Different MRI scanners may have influence on ADC values, but does not affect its reproducibility. Therefore, when ADC values obtained on different MR scanners are compared in clinical analysis, this influence should be considered.
