ABSTRACT
ObjectiveTo recognize the normal CT appearances of adult pterygoid hamulus and increase the ability to recognize pterygoid hamulus abnormalities.Methods The pterygoid hamulus of 108 normal adults ( male:53 cases,female,55 cases) were studied with MIP and VR reconstructive images by 64-slice spiral CT in order to observe its normal shape,to measure its length,diameter,vertical height,horizontal width,abduct angle in coronal position and post-abducent angle in anteroposterior position.The differences between genders,two sides and age groups were compared,respectively.ResultsThe normal pterygoid hamulus had a wide basal body and a pillar caudomedial part with round or intumescentia extreme.In coronal position,the distal end towards outer direction in 214 sides and 2 sides in inner direction. In anteroposterior position,the distal end towards posterior direction in 190 sides and anterior direction in 26 sides.The pterygoid hamulus length,vertical height,and horizontal width of adult males were (8.18 ± 0.94) mm,(7.23 ±0.92) mm,(4.27 ±0.81 ) mm,respectively.They were larger than the adult females (7.31 ± 1.01) mm,(6.26 ±0.90) mm,(3.97 ±0.82) mm,and the difference was statistically significant (t values were 6.56,7.86,2.72 respectively,P ＜ 0.05).The pterygoid hamulus vertical height of age group over 60 years old (7.13 ± 1.35) mm exceeded the age groups of 18-39 (6.55 ±0.86) mm.The difference was statistically significant ( F =4.95,P ＜ 0.05 ).Conclusions64-slice spiral CT could display the shape,length and angle of pterygoid hamulus in full. It could help to recognize correlated pterygoid hamulus diseases.
ABSTRACT
ObjectiveTo investigate the value of perfusion CT imaging in thyroid nodule. Methods Of the 40 cases of post-surgical thyroid nodule identified by pathology, nodular goiter was verified in 22 cases, thyroid adenoma in 6 cases,and thyroid carcinoma in 12 cases. All cases underwent CT perfusion scan at preoperative. The perfusion parameters including the blood flow ( BF), blood volume ( BV ), mean transit time ( MTT), and permeability of surface (PS) of region of interest (ROI) were calculated. The Mann-whitney test was used to comparing the differences of the different perfusion parameters. The ones with statistical significance would be introduced into the discriminatory analysis to distinguish the benign and malignant thyroid nodule. ResultsThe median MTT in 28 cases with benign thyroid nodule were 4. 33 s (Min 1.42 s,Max 10. 93 s), and that in 12 cases with malignant nodules were 2. 18 s( Min 1. 95 s, Max 2. 87 s). The difference had statistical significance ( P ＝ 0. 00 ) . The median BF in cases with thyroid carcinoma was 560. 23( Min 330. 66, Max 1000.00) ml ·100 g-1 ·min-1, and that in cases with the benign nodular were 374.79(Min 117.47,Max 1000.00) ml · 100 g-1 · min-1. There was a significant statistical difference ( P ＝0. 01 ). Through the discriminatory analysis, the difference of MTT between benign and malignant nodules were statistically significant (P ＝ 0. 00 ).After establing the Bayes discriminatory function, the overall diagnostic accuracy was 87.5％ (35/40).Conclusions MTT and BF are useful parameters in CT perfusion imaging to distinguish the benign and malignant thyroid nodules and the MTT is more accuracy.