Related Experiment Video
Updated: Aug 15, 2026
Development and Angiographic Use of the Rabbit VX2 Model for Liver Cancer
Published on: January 7, 2019
MR diffusion-weighed imaging of rabbit liver
You-Hong Yuan1, En-Hua Xiao, Zhong He
1Department of Radiology, the Second Xiangya Hospital, Central South University, Changsha 410011, Hunan Province, China.
Aim:
To study the techniques of MR diffusion-weighed imaging (DWI) for normal rabbit liver.
Methods:
After 15 normal New Zealand white rabbits and one New Zealand white rabbit implanted with VX-2 tumor were anesthetized with 3% soluble pentobarbitone, DWI was performed respectively for different b values, repetition times (TR) or thicknesses, when other parameters were the same and magnetic resonance imaging (MRI) was performed respectively, or with different field of views (FOV) or coil when other parameters were the same. The distinction between groups was analyzed by SPSS10.0 with apparent diffusion coefficient (ADC), quality index (QI) or signal-noise ratio (SNR).
Results:
As b value increased, liver ADC, QI and SNR of DWI became smaller and simultaneously (F = 292.87, 156.1, 88.23, P<0.01). QI of DWI was high, when b value was 10, 50 or 100 respectively, but the distinction between them was insignificant; when b value was 800, QI and SNR of DWI were low. QI and SNR of DWI had no significant difference between TR = 4 000, 6 000 and 8 000. QI of DWI with 2 mm thickness was bigger than that with 5 mm thickness (t = 3.04, P<0.01), but SNR of DWI with 2 mm thickness was significantly smaller (t = -17.86, P<0.01). SNR of MRI with knee joint coil was obviously bigger than that with cranium coil (t = -5.77 (T1WI) or -4.02 (T2WI), P<0.01), but QI of MRI was smaller on the contrary (t = 7.10 (T1WI) or 3.97 (T2WI), P<0.01). When FOV was enlarged gradually, SNR of MRI increased (F = 85.81 (T1WI) or 221.96 (T2WI), P<0.01), but QI firstly increased, then decreased (F = 68.67 (T1WI) or 69.46 (T2WI), P<0.01) and QI of MRI was the biggest when FOV was 20 cm x 15 cm.
Conclusion:
The scanning technique is very important in DWI of rabbit liver and the overall quality of DWI with b (100 s/mm2), thickness (2 mm), cranium coils and FOV (20 cm x 15 cm) was best in our study, when other parameters were the same.
Insights
Optimizing magnetic resonance imaging (MRI) diffusion-weighted imaging (DWI) techniques for rabbit livers involves careful selection of parameters. The study found that specific settings for b-value, slice thickness, coil, and field of view significantly impact image quality and signal-to-noise ratio.
Area of Science:
- Radiology
- Medical Imaging
- Biomedical Engineering
Background:
- Diffusion-weighted imaging (DWI) is a crucial MRI technique for assessing tissue microstructure.
- Optimizing DWI parameters is essential for accurate interpretation of liver imaging in animal models.
- Rabbit liver models are frequently used in preclinical research, necessitating standardized imaging protocols.
Purpose of the Study:
- To investigate the impact of various technical parameters on the quality of MR diffusion-weighted imaging (DWI) of the normal rabbit liver.
- To identify optimal settings for DWI acquisition in rabbit liver studies to enhance diagnostic accuracy.
- To evaluate the trade-offs between signal-to-noise ratio (SNR) and image quality index (QI) under different DWI parameters.
Main Methods:
- Diffusion-weighted imaging (DWI) was performed on New Zealand white rabbits using varying b-values, repetition times (TR), slice thicknesses, field of views (FOV), and MRI coils.
- Image quality was assessed using apparent diffusion coefficient (ADC), signal-noise ratio (SNR), and a quality index (QI).
- Statistical analysis (SPSS 10.0) was employed to determine significant differences between parameter groups.
Main Results:
- Increasing b-value decreased liver ADC, QI, and SNR. Optimal QI was observed at lower b-values (10-100 s/mm²), while higher b-values (800 s/mm²) resulted in lower QI and SNR.
- Slice thickness significantly affected QI and SNR; thinner slices (2 mm) improved QI but reduced SNR compared to thicker slices (5 mm).
- Coil type and FOV influenced SNR and QI, with specific combinations yielding superior results (e.g., knee joint coil, 20 cm x 15 cm FOV).
Conclusions:
- Scanning technique parameters critically influence DWI quality in rabbit liver imaging.
- The study identified optimal parameters: b-value of 100 s/mm², 2 mm slice thickness, cranium coils, and a 20 cm x 15 cm FOV, yielding the best overall image quality.
- These findings provide guidance for standardizing DWI protocols in preclinical rabbit liver research.
