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Objective To investigate the influence of menstrucal cycle and anatomic site on the fractional anisotropy (FA) values of diffusion tensor imaging (DTI) in normal breast. Methods Prospectively enrolled 96 volunteers, who have identified with normal menstrucal phase and without breast diseases were found via the breast examination, ultrasound and MRI scan. The cases were divided into three groups according to menstrucal phase: menstrual period group(menstrual cramps 1 to 6 d), proliferative phase group(menstrual cramps 7 to 14 d) and secretory phase group(menstrual cramps 15 d to the next), and each group consisted of 32 subjects. All subjects were performed bilateral breast cross-sectional T1WI, T2WI, DWI and DTI scaning. On the nipple level figture, the mammary gland was divided into three regions including the anterior, central and posterior parts, and the FA values of the different phases and regions were measured. The Kruskal-Wallis H test was applied to analyse the difference of FA values in different menstrual phase and anatomic site. Results The FA values of the anterior region in menstrual phase, proliferative phase and secretary phase were 0.21 ± 0.07, 0.24 ± 0.09 and 0.17 ± 0.07, and the difference had significant difference(P=0.014).The FA values of the central region were respectively 0.15±0.08, 0.18±0.09 and 0.15±0.07, and without the statistically significant difference(P=0.090). The FA values of the posterior region were 0.21 ± 0.11, 0.24 ± 0.13 and 0.16 ± 0.11, and also showed significant difference(P=0.002). In different regions, the difference of FA values between menstrual phases and proliferative phases were also had statistically significant(P=0.018, 0.045, respectively). In the same region, the FA value was lowest in the secretary phase, and the proliferative phase was slightly higher than menstrual phase. Conclusion The FA values are affected by menstrual cycle and anatomic site.
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Objective To explore the feasibility of quantitative hemodynamics measurement of inferior vena cava (IVC) in healthy volunteers with phase-contrast sequence on 3.0 T MR system (3.0 T PC-MRI),and to evaluate the relationship between IVC lumen area,blood flow,and velocity.Methods Fifty healthy adult volunteers prospective underwent IVC PC-MRI at 3.0 T MR system.All volunteers were from our hospital for the routine chest or abdomen examinations,no heart disease and lung disease always,heart rate,blood pressure,electrocardiogram was in normal range,no abnormalities were found in clinical and abdominal imaging examinations,and IVC disease was excluded by ultrasonic examination.The area (A),mean velocity (MV),mean flux (MF),regurgitant fraction (RF) and time-flow curve of upper and middle segments of IVC during one cardiac cycle were observed.Independent samples t test was used to compare IVC lumen area and blood flow,velocity between different genders,different age groups (18 to 30 years old group,more than 30 years old group) and different phase velocity encoding value of IVC middle segment,one-way ANOVA was used to compare different phase velocity encoding value of IVC upper segment [(60,80,100)cm/s].Pearson correlation coefficient and regression equation were used to evaluate the relationships between area,blood flow,and velocity.Results Among 50 patients with successful completion of the examination,significant difference was found in A,MV,MF and RF between the different IVC segments.MF of the IVC middle segment were (37.94 ± 7.32) and (33.68 ± 6.65) ml/s in male (n =24) and female (n =26),respectively ; significant difference was found in different genders (t =2.49,P =0.017).MF of upper segment and middle segments of IVC were (54.89 ± 10.98)and (38.29 ± 7.54)ml/s in 18 to 30 years old group(n =27),while MF of upper segment and the middle of IVC were (44.96 ± 8.49) and (32.65 ± 5.59) ml/s in older than 30 years old group (n =23) with significant difference(t =3.34,2.15,P ＜ 0.01).Peak positive velocity were (55.36 ± 6.30),(61.30 ± 12.42),(62.55 ± 13.09) cnm/s in different phase velocities (60,80 and 100 cm/s),while peak negative velocity (PNV) were (42.37 ± 19.18),(32.79 ± 24.67),(24.61 ± 21.20) cm/s with significant differences (F =4.258,7.794,P ＜ 0.05).The overall image quality was good for quantitative measurement between different phase velocity encoding values of upper segment and the middle IVC (image evaluation are greater than or equal to 3,11 patients were three points,24 patients were four points,15 patients five points).The relation between the PC flow image of IVC and the cardiac cycle was sine wave,the area and the velocity of upper and middle segments of IVC was negative (r =-0.466 and-0.765,P ＜ 0.01),and no linear correlation between the area and the flow of upper and middle segments of IVC (r =0.259,0.046,P ＞ 0.05).There were slight reverse flow during systolic and diastolic cycle.Conclusion The area,flow and velocity of IVC can be rapidly,accurately and noninvasive measured with PC-MRI,and different ages,different genders and different anatomical parts of IVC had obvious hemodynamic differences.
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BACKGROUND:The effects of simple neural stem cell(NSC)transplantation on repair of damaged spinal cord are not ideal.Previous studies have shown that newa growth factor(NGF)has both effects of neuron nutrition and process growth promotion,can effectively contribute to the recovery of neurofunction following spinal cord injury(SCI).OBJECTIVE:To investigate the effect of neuraI sterR cell transplantation combined with NGF application on the recovery of motor function of ratswith SCI.METHODS:A total of 42 Sprague Dawley rats were used to establish SPI models.and then divided randomly into thtee groups:medium,simple NSCs or NSCs+NGF.At 1 week foliowing injury,medium,simple NSCs or NSCs+NGF were separately injected into damaged sites.At 1,2,4,6.8 weeks post-injury.all animals were evaluated on the hind limb behavior with Basso.Beattie and Bresnahan(BBB)locomotor rating scale and inclined plane test.At 4 weeks post-transplantation,histopathology hematoxylin-eosin staining and BrdU immunohistochemistry were performed.At 8 weeks post-transplantation.horseradish peroxidase(HRP)nerve trace and somatosensory evoked potential testing were performed to observe the recovery of nerve electrophysiology.RESULTS AND CONCLUSION:At 4 weeks fo,owing injury.motor function of the rat hindlimb was significantly improved in the simple NSCs group and NSCs+NGF group.The recovery was rapid in the NSCs+NGF group than the simple NSCs group(P＜0.05).The recovery was slight in the medium group.Pathological sections demonstrated that neurite was not found in the medium group.A few neurites were seen in the simple NSCs group.and many neurites were observed in the NSCs+NGF group.Numbers of BrdU-positive cells and HRP-positive nerve fibers:NSCs+NGF group＞simple NSCs group＞medium group there was significant difference among groups(P＜0.01).Latent period and amplitude of somatosensory evoked potentials in the NSCs+NGF group were superior to the simple NSCs group(P＜0.05),and significantly better than the medium group(P＜0.01).Results suggested that NSC transplantation can promote the recovery of hindlimb function,and combined with NGF presents synergic effect.