Real world superposition cannot be performed without the use of collimation
Parks et al reported that film placement errors were not affected regardless of collimation
technique used or operator skill.
The evaluation was based on x-ray beam collimation
observed on radiographs stored in the film library of the hospitals, questionnaires administered to radiographers and light beam misalignment test conducted on the x-ray machines.
Other simple dose-reduction strategies include decreasing the tube current or tube voltage, increasing pitch, and choosing wider collimation
2 [micro]Gy per image for group A; the protocol included collimation
We performed thoracic high-resolution computed axial tomography (HRCT), using 7 mm helical technique after intravenous contrast administration followed by high-resolution imaging, using 1 mm collimation
every 1 cm from lung apex to base (Figure 1B-D).
It can be attained by the magnetic collimation
method, which is independent of the position of neutron [beta]-decay.
They include better collimation
for cleaner signal and better cooling for extended life.
PolyLED lamps are solid-state light sources that provide the high reliability and light collimation
associated with leaded discrete LEDs.
Coronal noncontrast computed tomography (CT) performed with 3-mm collimation
and interval revealed a left ICB, minimal and scattered mucosal thickening, and partial bilateral ostiomeatal unit obstruction (figure).
These include improving the tracking speed to 10 degrees/second, the automatic collimation
area to +/- 5 degrees, the distance measuring range to 7,200 feet to a single prism and the tilt compensating range to +/-4 feet.
Features include mechanical or optical x-ray beam collimation
, gas proportional counter or semiconductor x-ray detector, and dual-encoded stage driver options.