Histogram compensation algorithm for an efficient phase-only hologram calculation.

A fast computer-generated phase-only hologram (POH) calculation is needed to realize a holographic display. Existing iterative methods require many iterations and thus require speed improvement, and noniterative methods add constraints to the image, resulting in restrictions on quality or range of expression. In this paper, we propose an efficient iteration algorithm without using a feedback process.

The change of pain and lumbosacral sagittal alignment after sling exercise therapy for patients with chronic low back pain.

[Purpose] This study was conducted to quantify the effect of sling exercise therapy in the recovery of lumbosacral sagittal alignment (LSA) and in the control of low back pain. [Subjects and Methods] A total of 102 chronic low back pain patients were divided into two groups, a physical therapy group and a sling exercise group. In both groups, programs were conducted thrice a week for twelve weeks.