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Hitachi Healthcare America

Reduce Dose, Improve CT Image Quality


 

Written by M. Silverman, Director – CT Marketing, Hitachi Healthcare Americas | July 2020

Human centered design is a development process that aims to make systems more usable and useful by focusing on the users’ needs and requirements and applying human ergonomics and usability knowledge.

The Scenaria View’s Lateral Shift Table, with ±10cm shift range, exemplifies how Hitachi uses Human Centered Design to intelligently combine and leverage a creative feature that takes advantage of a basic CT physics principle to create valuable benefits for CT stakeholders.

Hitachi engineers recognized the unique synergies that will occur by adding to a CT System an IntelliCenter Auto-Lateral Shifting Table combined with use of the small-sized bowtie filter that all CT systems already include. The combination can then be leveraged with the physics principle that all CT systems have their best spatial resolution at the center of rotation where attenuation measurements are most tightly spaced.

Lateral Shift Table

The benefits of adding and combining the Lateral Shift Table include:

  • By shifting laterally the anatomy of interest to the center of rotation, spatial resolution can be increased.
  • Combining this centering with enabling the system to insert its smaller 24cm bow-tie filter also demonstrates dose reductions*.
  • This resolution improvement and dose reduction* occur with easier accurate patient positioning for the CT Technologist, eliminating added time spent (and physical stress) to manually reposition the patient if off-center positioning is noted after the scout scan is performed. Hitachi enables lateral post-scout positioning changes from the Scanning Console without the need to re-scout; a time saver. And, positioning adjustment based on the scout exam is the most accurate determination of centering, because the Scout is not fooled by a patient wrapped in a blanket(s) as can occur when positioning is judged by the human eye or by an overhead camera, such as some manufacturers’ recommend.

shoulder

Adding a Lateral Shift Table with a wide shift range of ±10cm provides every-patient benefits. The Scenaria View enables centering of anatomy that is near center such as the heart, but also anatomy far from center such as shoulders, hips and ankles.

*In clinical use, dose saving features may reduce CT patient dose depending on the clinical task, patient size, anatomical location and clinical practices employed. Consultation with a radiologist and physicist are recommended to determine the appropriate dose needed to obtain diagnostic image quality for a particular clinical task.