QQ截屏

1、hromesignal sources. (See note.) The practice providesusers of medical diagnostic imaging systems with acomprehensive test pattern for day-to-day operationalchecks and adjustments of focus, brightness andcontrast, resolution response, mid-band streaking,uniformity, and linearity of viewing monitors and hard-copy recordings. This practice is not intended to cre-ate a standard for image characteristics such asresolution, geometry and linearity, uniformity, phos-phor defects, etc. However, use of t。