Research advances in imaging evaluation of extramural vascular invasion of rectal cancer / 中华消化外科杂志

Extramural vascular invasion of rectal cancer is an important factor affecting the prognosis of patients with rectal cancer. Accurate diagnosis of extramural vascular invasion before surgery can guide the formulation of treatment plans, thereby improving prognosis and long-term survival of patients. Magnectic resonance imaging examination and computed tomography examination are the main examination methods for preoperative evaluation of rectal cancer. The authors review the role of imaging examinations in the evaluation of extramural vascular invasion of rectal cancer.

Clinical evaluation of coronary angiography by prospective ECG gated sequence scanning using second generation dual source CT:no heart rate control / 实用放射学杂志

Objective To analyze the effects of image quality and radiation dose of the patients with no heart rate control on different acquisition window settings.Methods A total of 75 patients underwent CTCA scan,with a median age of 55 years.All patients had no heart rate control.HR≤65 beats per minute acquisition phase setting was from 65%to 75%,65 beats per minute80 beats per minute acquisition phase setting was from 35%to 45%.Evaluated patients radiation dose and subjective image quality of coronary artery.Results 75 patients with ED was (2.44±1.21)mSv,group A was (1.54±0.41)mSv, group B was (3.57±0.53)mSv,group C was (1.64±0.27)mSv,group A vs group B(P=0.000),group A vs group C(P=0.854),group B vs group C(P=0.000).A total of 1 043 coronary artery segments of 75 patients were evaluated,with an average of 13.9 segments showed by every case,(3.66±0.51)scale.Group A was (3.75±0.44)scale,group B was (3.60±0.54)scale,group C was (3.38±0.67) scale,group A vs group B(P=0.000),group A vs group C(P=0.004),group B vs group C(P=0.032).Conclusion The prospective ECG gated sequence scan could obtain the image quality and avoid unnecessary radiation dose by adapting to the different heart rate.

CT imaging appearance and pathological features of basal cell adenoma in parotid gland / 局解手术学杂志

Objective To evaluate the clinical,pathological and imaging features of basal cell adenoma in the parotid. Methods The clinical,pathological and CT imaging data of 21 cases with parotid basal cell tumor confirmed by operation and pathology were retrospectively analyzed. Results All 21 patients(5 male,16 female ) had solitary BCA lesion,which located at the superficial lobe of parotid gland(n=17)and involved both the superficial and deep lobe(n=4). Twelve lesions were well-defined and cystic degeneration was displayed in 9 le-sions,3 lesions had punctate calcification at the edge of tumor. All lesions were significantly enhanced,the enhancement of BCA in the ve-nous phase was close to the arterial phase. Conclusion The CT features of BCA in parotid gland are characteristic,which is helpful to make qualitative diagnosis when in combination with clinical features.

The tube current modulation base on time bolus peak in low voltage:a clinical study / 实用放射学杂志

Objective To evaluate the image quality and obtained by the tube current modulation base on time bolus peak in low voltage in CTPA.Methods 30 consecutive patients suspected pulmonary embolism(PE)were prospectively enrolled,and satisfy the following conditions.The study was performed by 64-slice spiral CT system (lightspeed VCT-XT,GE healthcare),Tube voltage was set at 80 kV.Tube current settings related to the attenuation of ROIs by test bolus peak.The injection parameters were set up by injection flow rate (4 mL/s),contrast medium dose (28 mL),and saline flushing dose (40 mL).All images were evaluated by two observers blinded to pulmonary CTA protocol,including attenuation,noise,SNR and CNR.The image quality was evaluate by 4-score.To evaluate the relationship between influential factor and image quality using Pearson correlation analysis.A P-value 0.05 ).The mean attenuation,noise,SNR and CNR on pulmonary trunk was (628.63±146.46)HU,(53.92±14.07)HU,12.02±3.1 7 and 10.81±3.10,respectively.The percentage of assessable pulmonary arteries was 95.82%.Conclusion The tube current modulation base on time bolus peak in low voltage could offer assessable image quality and raise image stability.

Comparison between coronary plaque 64-slice spiral CT characteristics and risk factors of coronary artery disease patients in Chinese Han population and Mongolian

To compare the coronary atherosclerotic plaque 64-slice spiral CT characteristics and the risk factors of Han [in Inner Mongolia] and Mongolian coronary artery disease patients. The plaques of 126 Mongolian and 269 Han patients were analyzed by 64-slice spiral CT coronary angiography. Their gender, age, height, body mass, the history of hypertension, diabetes, smoking and family diseases, the levels of triglycerides [TG], total cholesterol [TC], high density lipoprotein cholesterol [HDL-C] and low density lipoprotein cholesterol [LDL-C] were compared. The incidence of plaques [P < 0.05], the proportion of plaques in the circumflex branch [P < 0.05], the proportion of medium-severe lumen stenosis induced by plaques [P < 0.05], and the proportion of obstructive plaque involved multi-branch [P < 0.05] of the Mongolian patients were higher. The plaque compositions of the two groups did not differ significantly [P > 0.05]. The body mass index of the Mongolian patients was higher [P < 0.05]. The hypertension, diabetes, smoking history, TG, TC, HDL-C and LDL-C of the two groups did not differ significantly [P > 0.05]. The higher incidence of coronary atherosclerotic plaques and the more severe lesions of the Mongolian patients may be related to their higher body mass index

Functional evaluation of normothermic ischemia and reperfusion injury in dog kidney by using MR perfusion-weighted imaging / 中华放射学杂志

Objective To evaluate the functional alternations of canine renal ischemia and reperfusion injury by using MR perfusion-weighted imaging, and to correlate the imaging with the pathologic findings. Methods Using 1. 5 T MR system, four groups of three anesthetized dogs each were studied by left renal artery ligation for 30-, 60-, 90-, and 120-min, respectively, after the removal of ligation, reperfusion injury was suffered for one hour. True-FISP, TSE, and EPI sequences were performed in five different time phases ( pre-ischemia, onset-ischemia, post-ischemia, onset-reperfusion, and post-reperfusion). Finally, IR-turbo-FLASH sequence (TR 5. 8 ms, TE 3. 2 ms, TI 400 ms, FA 12?) with a temporal resolution of 1. 16 s was performed. Signal intensity (SI) in cortex, outer medulla, and inner medulla was measured. SI was plotted as a function of time. Peak height (P) , time to peak (Tp) , and the area (A) under the time-course curves after the intravenous injection of Gd-DTPA were estimated. Blood and urine examples were collected for measuring serum creatinine level and urinary protein before and after the insult. Histologic examination was performed with light and electron microscopy in all dogs. Results After arterial ligation,there was marked and significant reduction in the SI of each layer of left kidney on true-FISP, TSE, and EPI, except for the SI of inner medulla on TSE. After the removal of ligation,there were no significant differences in the SI of cortex of both kidneys, however, significant differences in the SI of outer and inner medulla of both kidneys remained on EPI in all groups. The turbo-FLASH study clearly depicted the three-phase pattern of SI changes in each layer on right kidney. The uniphasic enhancement pattern in all groups was showed in outer and inner medulla on left kidney, with the area under the curve decreased. Conclusion This preliminary study shows that MR perfusion-weighted imaging may be useful and very promising for the evaluation of renal dysfunction following normothermic ischemia and reperfusion injury.