C-arm hip fluoroscopy at primary position in the internal fixation of femoral neck fracture / 中华创伤骨科杂志

Objective:To evaluate the hip C-arm fluoroscopy at primary position in internal fixation of femoral neck fracture.Methods:A retrospective study was conducted of the 69 patients with femoral neck fracture who had been treated from August 2015 to August 2018.They were divided into a primary position group ( n=35) subjected to C-arm hip fluoroscopy at primary position under symmetry traction of bilateral lower limbs for reduction of femoral neck fracture and a control group ( n=34) subjected to C-arm hip fluoroscopy at frog’s position on the healthy side for traction and reduction of the injured hip. The 2 groups were compared in terms of fluoroscopy frequency, times of resetting guide pin, intraoperative blood loss and total operation time. Results:The 2 groups were comparable due to insignificant significances between them in the preoperative general data like gender, age, fracture type, injury cause, or interval from injury to operation ( P>0.05). Compared with the control group, the primary position group showed less intraoperative fluoroscopy (7.2 times ± 0.5 times versus 16.1 times ± 1.2 times), fewer times of resetting guide pin (2.1 times ± 0.31 times versus 4.7 times ± 0.8 times), less intraoperative blood loss (96.8 mL ± 18.6 mL versus 198.1 mL ± 13.2 mL), and shorter total operation time (1.2 h ± 0.2 h versus 1.6 h ± 0.3 h). All the differences were statistically significant ( P<0.05). Conclusions:C-arm hip fluoroscopy at primary position may protect the stability after fracture reduction because bilateral lower limbs are under symmetrical traction and the hip position needs no alteration. Operation of C-arm fluoroscopy is easy and convenient and produces clear images. Therefore, this new mode of fluoroscopy has advantages of less intraoperative fluoroscopy and guide pin resetting, leading to significantly reduced intraoperative blood loss, ineffective operation time and anesthesia time.

CT and MRI Diagnosis of Ovarian Dysgerminoma / 中国医学影像学杂志

Purpose Ovarian dysgerminoma has no specific symptoms or physical signs, which is thus prone to misdiagnosis before treatment. This paper aims to investigate CT and MRI clinical features of ovarian dysgerminoma, so as to provide an accurate basis for its clinical treatment and also improve patients'' life, quality.Materials and MethodsThe CT and MRI data of 13 patients with ovarian dysgerminoma proved by pathology were retrospectively analyzed. Three patients underwent plain and enhanced CT scan, 6 took plain and enhanced MRI scan on T1WI and T2WI with different angles of views, and 4 other patients were performed both CT and MRI scan.Results①Twelve patients had single lesions, and 1 was bilateral multiple ones. The diameter of the lesions ranged from 5.5 cm to 16.5 cm, with mean of (9.5±3.8) cm; in terms of pathological type, 11 belonged to single type and 2 were mixed.②The CT results showed that 6 were solid mass and 1 was cystic. On enhanced CT scan, 6 cases showed heterogeneous light-to-moderate enhancement, 4 had tumors with significantly enhanced blood vessels, and 1 showed heterogeneous significant enhancement at arterial phase; all cases presented continuous enhancement at venous phase.③The MRI manifestations demonstrated 8 were with solid mass, which displayed iso- or slightly hypointense signal on T1WI, and iso- or slightly hyperintense signal on T2WI. The enhanced scan showed that 5 cases had heterogeneous mild enhancement, 3 had moderate enhancement, and 4 were seen with tortuous tumor vessels at arterial phase; all displayed continuous enhancement at venous phase. In the one case of cystic mass, solid component had moderate enhancement at arterial phase and continuous enhancement at venous phase. In another case of multilocular cystic mass, the tumor separate and cyst were significantly enhanced at arterial phase, and were continuous enhanced with hyperintense at venous phase.Conclusion Ovarian dysgerminoma tumors present features such as large lesions with clear boundaries. Tumors of single type are likely to be solid mass with central necrosis; the plain CT scan shows isodensity; the plain MRI scan mainly shows isodensity on T1WI, and iso- or slight hyperintensity on T2WI; the enhanced scan presents slight to moderate enhancement. Tumors of mixed type demonstrate cystic mass; the solid and separate parts are significantly enhanced. The comprehensive analysis of imaging features of ovarian neoplasms could help to make a correct diagnosis before surgery.

A study about the radiation dose of full field digital mammography in different AOP mode / 重庆医学

Objective To study the method of selecting appropriate exposure parameter of AOP mode and reducing the radiation dose effective with the control of image quality .Methods The unique mammary phantom was mammography in three different AOP mode(DOSE mode ,STD mode and CNT mode) and compared the radiation dose .150 sample was selected randomly .50 sample each mode ,and recorded the radiation dose .All image reach the diagnostic standard .The mean dose of the each mode were computed and compared with others .Results whatever the phantom mammography and the sample mammography ,the mean dose in DOSE mode was lowest ,higher in STD mode ,and highest in CNT mode .The number of fiber cords ,mass and calcification fit the standard of quality control .The image of sample aslo fit the diagnostic standard .Conclusion In daily work ,we can lower the dose choosing appropriate mode according to the thickness and density of mammary .DOSE mode prior ,STD mode advocate limit to CNT mode .

Clinical application of the new method of axial view of patella / 重庆医科大学学报

Objective:To find a new method to show the subluxation of the patella that can not be displayed well by the traditional way. Methods:To measure the angel of the articular surface of the patello-femoraljoint with the wire that is parallel to the photographic bed to find the range of the angel of the x-ray tube’s centerline,then with the range of the angel ,the new axial view of patella can be taken with the supine position . Results:With this new method,the picture of the subluxation of the patella is very helpful to the clinical diagnosis. Conclusion:This new method of axial view of patella is accurate,easy to use and very useful to the diagnosis of the fracture of patella, but also useful to the estimate of the situation after operation.