Effects of practice on visual finger-force control in children at risk of developmental coordination disorder.

Background: The production of finger force control is essential for a large number of daily activities. There is evidence that deficits in the mechanisms of accuracy and control of finger force tasks are associated with children's motor difficulties.

Objective: To compare the effect of practice of an isometric finger force/torque task between children with significant movement difficulty and those with no difficulty movement.

Monte Carlo derivation of filtered tungsten anode X-ray spectra for dose computation in digital mammography.

Objective: Derive filtered tungsten X-ray spectra used in digital mammography systems by means of Monte Carlo simulations.

Materials And Methods: Filtered spectra for rhodium filter were obtained for tube potentials between 26 and 32 kV. The half-value layer (HVL) of simulated filtered spectra were compared with those obtained experimentally with a solid state detector Unfors model 8202031-H Xi R/F & MAM Detector Platinum and 8201023-C Xi Base unit Platinum Plus w mAs in a Hologic Selenia Dimensions system using a direct radiography mode.

Dosimetry and image quality assessment in a direct radiography system.

Objective: To evaluate the mean glandular dose with a solid state detector and the image quality in a direct radiography system, utilizing phantoms.

Materials And Methods: Irradiations were performed with automatic exposure control and polymethyl methacrylate slabs with different thicknesses to calculate glandular dose values. The image quality was evaluated by means of the structures visualized on the images of the phantoms.

Hand digit control in children: motor overflow in multi-finger pressing force vector space during maximum voluntary force production.

The aim of this study was to investigate the contralateral motor overflow in children during single-finger and multi-finger maximum force production tasks. Forty-five right handed children, 5-11 years of age produced maximum isometric pressing force in flexion or extension with single fingers or all four fingers of their right hand. The forces produced by individual fingers of the right and left hands were recorded and analyzed in four-dimensional finger force vector space.