CT Radiation Dose: Philips Perspective
Fulfilling the demand for effective diagnostic and therapeutic information has led to a steady increase in the use of computed tomography (CT). With this trend, CT departments strive to scan with the “As Low As Reasonably Achievable” (ALARA) principle; however, its practice varies significantly among sites and scanners servicing an ever-widening range of clinical indications and patient populations. Philips strategies for simplifying CT dose management are described. Multiple components of the Philips CT imaging chain have been designed to increase volume imaging speed, dose efficiency, and image quality, thereby enabling opportunities for lower dose scan protocols and helping to achieve doses ALARA. In addition, nine seamlessly integrated protocol-driven and patient-adaptive technologies including DoseRight Automatic Current Selection, DoseRight dose modulation, DoseRight Cardiac, Step & Shoot, IntelliBeam Filters, SmartShape Wedge (bowtie) Filters, Eclipse DoseRight collimator, and iDose4 Iterative Reconstruction Technique are described. These combined technologies automatically use the quantity and quality of radiation where and when needed, leading to image quality improvements and dose reductions. Combining Philips’ dose optimized CT imaging chain with automatic dose optimization tools begins a new era where expanding multi-detector CT will be fueled not only by increasing clinical benefits, but also by easily lowering dose to levels not previously possible for broader patient populations.
KeywordsImage Quality Filter Back Projection Iterative Reconstruction Technique Dose Saving Dose Efficiency
We would like to thank our colleague Mark Olszewski, from Philips HealthCare CT Product Management, for taking the time to assess this manuscript. His comments were greatly appreciated. We also would like to thank our colleagues Efrat Shefer and Leon de Vries, from Philips CT Clinical Science for their careful reading and corrections to this chapter. All clinical images presented in this chapter are courtesy of Professor E. Coche, from the Cliniques Universitaires Saint-Luc (UCL) at Brussels in Belgium.
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