Low-dose multi-slice CT with three dimensional rendering of the tendons of foot and ankle
10.3760/cma.j.issn.1005-1201.2011.03.009
- VernacularTitle:足踝部肌腱的多层CT低剂量三维成像研究
- Author:
Guanmin YU
;
Huimin LI
- Publication Type:Journal Article
- Keywords:
Foot;
Tomography,X-ray computed;
Radiation dosage;
Ankle;
Tendons
- From:
Chinese Journal of Radiology
2011;45(3):270-273
- CountryChina
- Language:Chinese
-
Abstract:
ObjectiveTo study the feasibility and reasonability of low-dose multi-slice CT(MSCT)with three dimensional rendering of the tendons of foot and ankle. The statistical methods including ANOVA and Kruskal-Wallis H was used. MethodsForty-five consecutive patients with fractures of foot and ankle were enrolled and evenly grouped into A (80 kV, 100 mAs), B(110 k V ,60 mAs) and C (130 kV,60 mAs).The MSCT scanning range was 6 slices of 1.0 mm. The CT value and standard deviation (SD) of the muscle and the CTDIvol were recorded. The image quality of volume rendering of the tendons was blindly evaluated.ResultsThe CT value of muscle in group A (71.6 ± 12.0) HU was significantly higher than group B [(66.8±9.2) HU, P=0.010]and C[(66. 1 ±7. 1) HU, P =0.004]. The SD average values were 11.9, 6. 1 and 7.0 HU for three groups, and there were significant differences among the three groups(F =37. 142, P=0. 0000). Group A had the highest SD value, group C had the lowest SD;CT1DIvol average value were (3.01 ± 0. 08) , (4. 63 ± 0. 11), (7.02 ± 0. 24) mGy respectively, which were significant different among the three groups (H =39. 185, P =0. 000). Group A had the lowest CTDIvol, while group C had the highest CTDIvol. Volume rendering of the tendons was evaluated as 2.3 ± 0. 5、3.7 ± 0. 5、4. 8 ±0. 4, and there were significant differences among the three groups (H = 72. 779, P = 0. 000). Group A had the worst VR images, while group C had the best VR images.All VR images in Group B were good for diagnosis. ConclusionThe protocol of 110 kV, 60 mAs, and 1 mm × 6 with three-dimensional volume rendering would be enough for evaluating the tendons of foot and ankle.
