Siemens Definition AS Plus

Description

Overview

The Siemens SOMATOM Definition AS+ is engineered as a top-tier single-source diagnostic CT scanner built to eliminate patient access barriers while raising clinical productivity. Positioned at the pinnacle of the Definition AS platform, the 128-slice AS+ system provides high temporal resolution (down to 150 ms) and fast coverage speeds (up to 23 cm/s), making it ideal for demanding clinical applications in cardiology, emergency medicine, neuro-vascular studies, and dynamic organ perfusion.

At the center of the scanner’s performance is Siemens’ zero-heat-capacity STRATON™ X-ray tube. Utilizing direct-oil cooling, the tube maintains high tube currents (up to 800 mA at lower kV settings) without requiring cooling pauses between acquisitions. Coupled with the FAST CARE workflow engine and optional Stellar detector architecture, the Definition AS+ generates high-contrast diagnostic detail while maintaining strict dose protection protocols.

Key Features & Advanced Technologies

• 128-Slice Acquisition & Stellar Detector Compatibility: Captures 128 fine slices per rotation. The optional integrated Stellar detector converts signals directly at the photodiode level (TrueSignal technology), cutting electronic background noise and delivering 0.33 mm isotropic voxel resolution.

• STRATON™ Tube Architecture: Uses direct-oil cooling to deliver an effective dissipation rate of 7.3 MHU/min. This eliminates mid-day tube-cooling wait times during multi-phase trauma CTA, thoracic studies, or long-range dynamic exams.

• Adaptive 4D Spiral Coverage: Overcomes physical detector dimensions by moving the table continuously to provide continuous dynamic volume scanning across up to 42 cm Z-axis coverage—ideal for whole-brain neuro perfusion and organ viability studies.

• SAFIRE™ & ADMIRE Iterative Reconstruction: Advanced model-based iterative reconstruction engines that reduce radiation dose exposure by up to 60% while maintaining sharp structural borders and low-contrast detail.

• FAST CARE Workflow & Automation:

  • FAST Planning: Automatically identifies anatomical structures to optimize scan ranges and field of view (FOV).

  • CARE kV: Automatically optimizes tube voltage (70–140 kV) based on patient size and diagnostic targets to keep patient exposure low.

  • X-CARE: Dynamically modulates X-ray intensity to cut radiation dose by up to 40% over dose-sensitive superficial tissues like breasts and the thyroid gland.

• iMAR (Iterative Metal Artifact Reduction): Suppresses severe streaking and beam-hardening artifacts caused by orthopedic joint replacements, dental fillings, and surgical clips.

• Single-Source Dual Energy: Optional Dual Energy acquisition mode allows material differentiation (e.g., bone vs. iodine, gout identification, kidney stone characterization) without invasive procedures.

Technical Specifications