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Objective To explore the imaging features of brucellar spondylitis (BS).Methods The imaging data of 49 cases who were diagnosed as brucellar spondylitis by a positive standard tube agglutination titer test (≥1:100) and (or) the isolation of brucella species from blood or other tissue at our institution between September 2012 and October 2016 were retrospectively reviewed.X-ray,CT scan and MRI examination was performed in 49,28 and 42 cases,respectively,of which 19 cases underwent both CT scan and MRI examination.The imaging manifestations of the spine were analyzed.The x2 test or Fisher's exact test were applied to compare the imaging manifestations of the patients who underwent both CT scan and MRI examination.Results Of the 49 patients,34 patients (69.4％) had involvement of the lumbar vertebra.Forty-five patients (91.8％) had contiguous involvement at adjacent 2 vertebral bodies.There were 10 cases (20.4％) with bony spur or bone bridge,3 cases (6.1％) with spondylolisthesis and 3 cases (6.1％)with slightly kyphosis deformity.There were 8 cases (28.6％) showing bone destruction of more than half of the vertebral body and 6 cases (21.4％) with sequestra on CT.There were 14 cases (33.3％) with psoas abscesses,of which 2 (4.8％) had migrating abscess.Epidural abscesses with dural sac compression were found in 17 cases (40.5％) and 3 cases (7.1％) showed nerve roots compression.There were statistically significant differences in the detection of vertebral bone destruction,bone marrow edema,hyperosteogeny,intervertebral disc changes,abscess formation and sequestrum between CT and MRI (P＜0.05).Conclusion BS has characteristic imaging features.The presence of bone destruction,sequestrum,and migrating abscess should warrant the possibility of BS.
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Objective To observe the value of CT spectral imaging in assessment of synovial hemosiderin deposition (SHD) in the knee joint in patients with hemophilic arthropathy (HA).Methods Twenty-five HA patients (40 assessable knees) underwent CT spectral imaging and MR scanning.According to the MRI international prophylaxis study group (IPSG) score of SHD,the knees were divided into mild group and severe group.CT value,iron (water) concentration (FeC),water (iron) concentration (WC),effective atomic number (Eff-Z) and average spectral curve slope (aSCS) of SHD area were measured and calculated,respectively.Meanwhile,the adjacent semi-membrane muscles in the same slice were taken as controls.The spectral parameters of CT were compared with One-Way ANOVA,and ROC curves were plotted to obtain the spectral parameters and the optical diagnostic threshold of SHD.Results CT value,FeC,and aSCS of SHD area were statistically significant among three groups (F=148.08,307.88,7.80,364.62 and 261.50,P＜0.01),and the differences of parameters between any two groups except WC were statistically significant (all P＜0.05).The area under ROC curve of SHD evaluated with aSCS was the largest,and the thresholds for the diagnosis of severe and mild SHD of aSCS was 1.84 and 0.42,respectively.Conclusion Multiple parameter analysis of CT spectral imaging is of great value for assessment of the severity of SHD in the knee joint in HA patients,therefore having important clinical significance.
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Objective To evaluate the effect on threshold of triggered angiographic acquisition by different iodine flow rate on renal artery CTA using Smart Prep tracking technique.Methods A total of 420 patients were randomly divided into A-D group with iodine flow rate of 0.90 gI/s,1.11 gI/s,1.20 gI/s,1.48 gI/s on average respectively.And each group were divided 7 subgroups with threshold 140-＜150 HU,150-＜ 160 HU,160-＜ 170 HU,170 ＜180 HU,180 ＜190 HU,190-＜200 HU,200-210 HU respectively.The quality of the images were graded from 1 5 by 2 radiologists.The best image quality subgroups were achieved,and the scores were compared among the best image quality subgroups.Results Image quality of renal CTA in each group were best performed with a threshold of 170-＜ 190 HU,160-＜ 190 HU,170-＜ 180 HU,160-＜ 180 HU respectively.When the threshold were 170-＜180 HU,image quality were good with all iodine flow rate groups.There was no significant difference among the scores of the best image quality subgroups (all P＞0.05).Conclusion Different iodine flow rate with appropriate threshold can acquire better image quality of renal CTA.
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Objective To investigate the feasibility of reducing spine metal artifacts with metal artifacts reduction technique (WARP) at 3.0 T MRI.Methods This study included 15 cervical and 14 lumbar spine cases.The image quality of WARP sequences and conventional sequences were compared (5 score evaluation scale) as well as the signal to noise ratio (SNR) and contrast noise ratio (CNR) of the image artifacts.The scanning time was recorded.Paired-t test and Mann-Whitney test were used respectively to compare the SNR and CNR,and qualitative scoring between the two sequences.P＜0.05 was considered to indicate a significant difference.Results The image distortion and blur of the WARP sequences were obviously reduced as compared to the conventional sequences.The SNR and CNR of artifacts of the WARP sequences were lower than that of the conventional sequences (All P＜0.05).The image quality scores of WARP sequences in cervical and lumbar spines[4(3 to 5) and 4(3 to 5)] were higher than that of conventional sequences[3(2 to 4),3(2 to 4)](P＜0.05).The scanning time of cervical spines in WARP sequence(14 min 9 s) was increased by 64 s (8.2％),and the time of lumbar spines (13 min 41 s) decreased by 9 s (1.1％).Conclusion The WARP sequences at 3.0 T could effectively reduce the artifacts of metallic prosthesis in cervical and lumbar spine without prolonging the scanning time at 3.0 T MRI.
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Objective To study the characteristic of operation design and analyze curative effect of laser sub-epithelial keratomileusis (LASEK) on low and midrange myopia in aged patients. Method Fiftyeight patients ( 114 eyes) no less than 35 years old were treated with LASEK by monoblepsis. The subjects were examined and analyzed at 3 days, 7 days, 1 month,3 months and 6 months after operation. Results Seventy-one corneas(62.28%) recovered well at 3 days after operation. At 1 month after operation, the acuity of vision of all patients achieved or exceeded corrected vision before operation,and lasted to 6 months after operation. The break up time of 63 eyes were lower than normal at 3 months after operation,but 6 months after operation all of them recovered to normal. The satisfaction of patients raised gradually. Conclusions LASEK is effective for no less than 35 years old myopic patients. Make operation plan refer to monoblepsis and patients' needs can receive more satisfaction.