Objective To obtain the matched parameters between image quality and radiation dose by exploring the influence of the exposure parameters of screening mammography on both the image quality and radiation dose.Methods The correlation between the exposure parameters and average glandular doses to 507 patients undergoing screening mammography were retrospectively analyzed.The influence of breast compression thickness on radiation dose by exposing different thickness of PMMA was obtained.The correlation with image quality was analyzed by combined testing of contrast detail test mode ( CDMAM3.4 )and different thickness of PMMAs.Results The groups aged 30 to 49 years were the main groups in 507examined patients,up to 67.06％ of the total.The mean value of average gland doses ( AGD ) in contrastprior mode was the highest in three kinds of exposure modes,accounting for 137.5％ of standard mode.In standard mode,target material/filtration board combination was Mo/Mo,Mo/Rh and Rh/Rh,accounting for 1/3 respectively.Mo/Rh and Rh/Rh were selected in dose-prior mode,accounting for 50％ respectively.Mo/Mo was mainly selected in contrast-prior,accounting for 52％.Breast compression thickness was positively correlated with average gland doses.Image quality figure inverse (IQFinv) under three kinds of modes (STD,DOSE,CNT) was 98.32,95.41 and 107.02,respectively,and IQFinv of contrast-prior mode was the highest among them.IQFinv was in general agreement in the three kinds of exposure modes when the thickness of PMMA plates plates was greater than or equal to 5 cm.Conclusions In clinical practice,when the breast is of density type and pressed thickness is less than 4 em,the dose-prior mode should be selected.When the pressed thickness is between 4 and 6 cm,the standard exposure mode should be selected.When the pressed thickness is larger than 6 cm,the manual mode should be selected.

Objective: To investigate influences of different rehabilitative methods on function of hands and psychological anxiety of patients with deeply burned hands retaining denatured dermis and grafting large autologous skin. Methods: Forty-four patients with deeply burned hands, conforming to the study criteria were admitted to Department of Burns and Reconstructive Surgery of Xiangya Hospital of Central South University from January 2014 to June 2015. Patients were divided into propaganda education rehabilitation group (PER, n=23) and specially-assigned person rehabilitation group (SAPR, n=21) according to the random number table and patients′ willingness. On post injury day 3 to 7, 36 burned hands in group PER and 33 burned hands in group SAPR underwent operation of retaining denatured dermis and grafting large autologous skin. Patients in 2 groups received anti-scar treatment of hands with silicone gel from postoperative day 10. Besides, patients in group PER underwent active functional exercise under guidance of duty nurse and received psychological guidance from duty nurse with grade two psychological consultant certificate. Patients in group SAPR underwent active and passive functional exercise under guidance of rehabilitation therapist and received psychological guidance from psychotherapist with intermediate title. In postoperative month (POM) 1, 3 and 6, ranges of active motion of burned finger joints of patients in 2 groups were measured with joint goniometer to calculate excellent and good ratio of total active motion (TAM) range. Values of grip strength of burned hands of patients were measured with electronic hand dynamometer, and psychological anxiety was scored with Self-rating Anxiety Scale (SAS). Data were processed with chi-square test, independent sample t test, McNemar test, analysis of variance of repeated measurement, SNK test and Bonferroni correction. Results: (1) Ratio of excellent and good of TAM range of burned finger joints of patients in group SAPR in POM 6 was obviously higher than that in group PER (χ²=10.745, P<0.0167 ). Ratio of excellent and good of TAM range of burned finger joints of patients in 2 groups in POM 3 were obviously higher than that in POM 1 of the same group, respectively (with P values below 0.0167). (2) Values of grip strength of burned hands of patients in group SAPR in POM 1, 3, and 6 were respectively (8.2±2.6), (21.6±2.6) and (30.1±2.3) kg, obviously higher than those in group PER [ (5.3±1.3), (12.8±2.7), (20.0±1.8) kg, respectively, with t values from 5.934 to 20.403, P values below 0.01]. Values of grip strength of burned hands of patients in 2 groups in POM 3 and 6 were obviously higher than those at the previous time point of the same group (with P values below 0.05). (3) SAS scores of patients in group SAPR in POM 1, 3 and 6 were significantly lower than those in group PER (with t values from 2.944 to 4.758, P values below 0.01). SAS scores of patients in 2 groups in POM 3 and 6 were significantly lower than those at the previous time point of the same group (with P values below 0.05). Conclusions Compared with rehabilitation of propaganda and education, rehabilitation under specially-assigned person can improve TAM range of burned finger joints, value of grip strength, and psychological anxiety of patients with deeply burned hands retaining the denatured dermis and grafting large autologous skin.