Multiple Sclerosis

Background: Developmental venous anomalies (DVAs) can be determined on magnetic resonance imaging (MRI), and they may be associated with multiple sclerosis (MS) lesions.Purpose: The objective was to evaluate the MRI findings of DVAs in the brain, to compare the prevalence of them between MS patients and control subjects, and to investigate the correlation of DVA-associated fluid-attenuated inversion recovery (FLAIR) hyperintensities and MRI-derived parameters between MS patients and control subjects having DVA.Methods: Total 160 patients with a mean age of 45 +/- 16 years who underwent multiparametric MRI including susceptibility-weighted imaging (SWI), diffusion-weighted imaging, 3D FLAIR, and contrast-enhanced imaging were included in this retrospective study. First, the presence of DVA was compared between the MS and control groups using the Chi-square test. Then, among the subjects having DVA, age, gender, and MRI-derived parameters such as the signal increase of DVA on FLAIR, location, and drainage of DVA were compared between the MS and control groups using Chi-square test.Results: The presence of DVA did not differ between the MS and control groups (P = 0.828). Signal increase around DVA on FLAIR (P = 0.03) and the age of less than 45 years demonstrated a significant correlation with MS group (P = 0.022).Conclusion: In our study, DVAs were effectively detected using SWI and 3D contrast-enhanced T-1-weighted imaging on MRI. The signal increase of DVA was better revealed on 3D FLAIR on MRI, and it was the only significant MRI-derived parameter in patients with MS.C1 [Sagtas, Ergin; Yavas, Huseyin Gokhan; Cakmak, Pinar; Ufuk, Furkan] Pamukkale Univ, Dept Radiol, Sch Med, Denizli, Turkey.[Guneyli, Serkan] Koc Univ, Dept Radiol, Sch Med, Davutpasa Cad,4 Topkapi, TR-34010 Istanbul, Turkey.[Akyilmaz, Dincer Aydin] Gaziantep Hatem Hosp, Dept Radiol, Gaziantep, Turkey

Spinal seeding of choroid plexus papilloma

[No abstract available

Analog Circuit Implementation of an Oscillation Controller for MEMS Gyroscopes

An oscillation controller is implemented using analog circuits on a vibrational MEMS gyroscope. The control goal is to drive the gyroscope to resonance despite the presences of disturbance and system uncertainties. Both discrete components and Field Programmable Analog Array (FPAA) are used to construct the circuit. The two implementation approaches are equally applicable, simple to build, easy to tune and economical. The experimental results not only verify the effectiveness of the controller but also demonstrate the successfulness of the analog implementation

Virtual touch IQ elastography in evaluation of Achilles tendon in patients with chronic renal failure

Purpose: To evaluate the sonoelastographic changes in the Achilles tendon in patients with chronic renal failure (CRF) using virtual touch imaging quantification (VTIQ) elastography. Methods: Twenty-six patients undergoing three hemodialysis sessions per week and 26 subjects admitted to our institution between January 2016 and April 2016 were included in this prospective study. The characteristics and body mass index of the patients were noted. Ultrasonography was performed parallel to the long axis of the bilateral Achilles tendons during relaxation of the legs using the Siemens Acuson S3000™ ultrasound device (Siemens HealthCare, Erlangen, Germany). Tendon thickness was reviewed, and tissue stiffness was quantitatively assessed using VTIQ elastography. Independent samples t test and Mann–Whitney U test were used for statistical analyses. Results: The median values of shear wave velocities of the Achilles tendon in patients with CRF were 7.19 m/s (4.23–9.77 m/s) on the right and 6.98 m/s (4.00–9.82 m/s) on the left, while they were 5.11 m/s (4.09–8.82 m/s) on the right and 5.36 m/s (4.05–8.80 m/s) on the left in controls. The stiffness of the Achilles tendons in patients with CRF was found to be higher than that in controls (right: P 0.05). Conclusion: The thickness and stiffness of tendon can be effectively evaluated with sonoelastography. The thickness of the Achilles tendon did not significantly differ between the patients with CRF and healthy subjects. However, the stiffness of the Achilles tendon measured with VTIQ elastography was demonstrated to be increased in the patients with CRF. © 2018, The Japan Society of Ultrasonics in Medicine