Objective To investigate the imaging characteristics and diagnostic value of tri-phase dynamic enhancement scan with CT for acute renal infarction. Methods The image features of CT plain scan and tri-phase dynamic enhancement scan of 10 patients (19 sides) with acute renal infarction were retrospectively analyzed, and the CTA expression of 6 patients were observed. Results Fourteen acute renal infarction lesions of 10 cases were diagnosed. The CT scan showed there were 4 cases with enlargement of kidney, and the other 6 cases were of no abnormality. The tri-phase enhancement CT scan showed there were 6 cases of unilateral renal infarction and 4 cases of bilateral renal infarction, which totally involving 14 sides. The acute renal infarction lesions lacked of high density region in the corticomedullary in cortical phase, and there were wedge-shaped hypodense area, even low density of full kidney in parenchymal phase and pyelographic phase. The a-cute renal infarction lesions were revealed better in parenchymal phase and pyelographic phase than in cortical phase. Six cases of CTA re-vealed the responsible vessels of renal infarction lesions and the other vascular diseases. Conclusion CT tri-phase dynamic enhancement scan has important value in the diagnosis of acute renal infarction, and CTA can identify the responsible vessels of renal infarction lesions.

Objective To investigate the gray matter volume differences between adult hypothyroid subjects and healthy controls using voxel-based morphometry (VBM).Methods A total of 28 untreated hypothyroid patients and 28 age and gender-matched uormal controlswere recruited.The coucentrations of their freetriiodothyronine (FT3),free theroxine (FT4),and thyroid stimulating hormone (TSH)were testedfrom their venous blood on the day they accepted MR scanning.High resolution 3D-datawereobtained using 3.0 T MRI scanner.VBM analysis was performed to detect the volume differences between the groups by using voxel-wise two sample t test.Multiple regression analysis was employed to analyze the influence exerted upon gray matter volume by serum FT3,FT4,and TSH concentrationof hypothyroid patients.Results Compared to controls,gray matter volumes in the bilateral superior frontal gyri,left precentralgyrus and bilateral cerebellum were decreased in hypothyroid patients (voxels 211-2 142,t=3.36-3.69,P＜0.01,corrected).No significant correlation between the gray matter volume in the above-mentioned brain regions and the clinical variables (serum FT3,FT4,and TSH concentration) (P＞0.05) was found in the multiple regression analysis.Conclusions VBM analysis revealed that hypothyroid patients exhibited reduced gray matter volume in multiple brain regions.It suggests that the lack of thyroid hormones can lead to the structural abnormalities in adult brain and selective gray matter atrophy in multiple brain regions.

Objective To explore the morphologic features of the biceps reflection pulley through the comparative study of the thin sec -tional anatomy based on the Chinese Visible Human ( CVH) and MRI sectional anatomy of the biceps reflection pulley ,and to provide ima-ging anatomic data for the diagnosis of lesions .Methods The thin slices of sagittal oblique plane and coronal oblique plane by visualization -al reconstruction based on 5 data set of the Chinese visible human ( CVH) were compared with the corresponding MR images from 20 shoulder joints of the normal volunteer individuals with routine MRI ,5 shoulders without abnormalities with MR arthrography .The detailed sectional a-natomy structure of the the biceps reflection pulley was marked from the CVH ,routine MRI and MR arthrography one by one with Photoshop CS2 software.Results The main three components of the biceps reflection pulley including the coracohumeral ligament (CHL),the superior glenohumeral ligament ( SGHL) ,and the long head of the biceps tendon ( LBT) were markedly displayed on the CVH and MRI .The CHL was markedly displayed on the sagittal oblique , using plain MRI .The SGHL was markedly displayed on the CVH , especially in the transverse plane.The LBT was markedly displayed on the CVH ,especially in the coronal oblique plane parallel to the LBT .The biceps reflection pulley was markedly displayed on the sagittal oblique plane with CVH and MR arthrography .The SGHL was perpendicular to the CHL , with T-shaped link anterior to the LBT on the sagittal oblique plane .Conclusion It is complementary for MRI and CVH displaying the components of the biceps reflection pulley .The sagittal oblique plane is the best position for displaying the components and adjacent structures of the bi -ceps reflection pulley ,which provide helpful position mark for the diagnosis of the lesions in the rotator interval .