CactuX SaguaroX Series Motorized XY Translation Stage for Micro-CT Sample Alignment

Overview

The CactuX SaguaroX Series is a high-precision, battery-powered motorized XY translation stage engineered specifically for sample positioning and centering in laboratory-scale micro-computed tomography (micro-CT) systems. Unlike generic motion stages, the SaguaroX integrates seamless wireless operation, robust mechanical architecture, and CT-specific ergonomics to address two critical challenges in non-destructive 3D imaging: reproducible sample alignment relative to the X-ray focal spot and minimization of beam-time overhead during setup. Its core functionality relies on closed-loop stepper motor actuation with optical encoder feedback, enabling sub-micron repeatability across full travel ranges. The stage operates independently of the CT cabinet’s internal power or control bus—eliminating cable routing constraints and reducing electromagnetic interference risks near sensitive X-ray detectors. Designed for integration into shielded CT enclosures, the SaguaroX complies with IEC 61000-6-3 (EMC emission limits) and meets mechanical safety requirements per ISO 12100 for low-energy motion devices.

Key Features

• Wireless operation via proprietary 2.4 GHz RF link (RF output < 4 mW), enabling full bidirectional control—including position query, speed adjustment, and homing—from outside the lead-lined CT cabinet without physical port penetration.
• Three scalable variants: SaguaroX S (7 kg max load, 50 × 50 mm travel), SaguaroX M (15 kg, 100 × 100 mm), and SaguaroX M Heavy (30 kg, 100 × 100 mm), all sharing identical kinematic design and control firmware for lab-wide protocol standardization.
• Integrated lithium-ion battery packs (14.6 V nominal) with intelligent charge-state monitoring; runtime validated under continuous 10 mm/s motion at rated load (8 h for S, 16 h for M/M Heavy).
• Low-profile, rigid aluminum alloy construction with hardened stainless-steel guide rails and preloaded linear bearings—engineered to maintain positional stability under thermal drift conditions typical in long-duration CT scans (e.g., >8 h acquisitions).
• IP20-rated enclosure suitable for cleanroom-adjacent lab environments; no internal fans or venting—minimizing particulate generation near X-ray optics and detector assemblies.

Sample Compatibility & Compliance

The SaguaroX accommodates standard CT sample holders—including cylindrical mounts (up to Ø130 mm for S, Ø210 mm for M/M Heavy), custom-machined fixtures, and multi-sample trays—via its standardized top-plate threading (M4 and M6 tapped holes distributed across the full sample area). Its open-top geometry allows unobstructed X-ray path access from both source and detector sides. All variants comply with EU Machinery Directive 2006/42/EC and carry CE marking. Electrical safety conforms to EN 61010-1 for laboratory equipment. While not intrinsically safe, the stage’s < 4 mW RF output satisfies FCC Part 15 Class B and ETSI EN 300 440-2 requirements for short-range devices, ensuring coexistence with CT system timing controllers and synchronization hardware.

Software & Data Management

CactuX provides a cross-platform SDK (Windows/macOS/Linux) supporting Python, MATLAB, and LabVIEW APIs for integration into automated CT workflows. Positional data—including absolute coordinates, velocity profiles, and battery voltage logs—is timestamped and exportable in CSV or HDF5 format. Audit trails are maintained per GLP/GMP principles: every command execution is logged with user ID (if authenticated), timestamp (UTC), and checksum-verified payload. Firmware updates are delivered via signed binary packages, supporting secure over-the-air (OTA) deployment without physical access. The SDK includes built-in support for ASTM E1441-compliant CT scan parameter scripting, enabling synchronized stage motion with X-ray exposure gating.

Applications

• Precision centering of biological specimens (e.g., murine femurs, plant stems) prior to high-resolution phase-contrast CT acquisition.
• Multi-position scanning workflows requiring automated repositioning between tomographic datasets (e.g., serial section tomography of composite materials).
• In situ mechanical testing integration—where the SaguaroX M Heavy supports load frames up to 30 kg while maintaining sub-5 µm positional fidelity during compression/tension cycles.
• Calibration phantom alignment for beam-hardening correction and spatial resolution validation (per ISO 15739 and ASTM E1695).
• Education and training labs: intuitive wireless interface reduces operator dependency on CT system OEM software, accelerating hands-on learning in X-ray imaging physics.

FAQ

Is the SaguaroX compatible with third-party CT reconstruction software such as Dragonfly or Avizo?
Yes—the SDK exposes raw stage position data and accepts external trigger signals, allowing direct synchronization with reconstruction pipelines that support custom hardware I/O.
Can the battery be replaced by the end user?
Battery modules are field-replaceable using Torx T10 tools; replacement units are calibrated and serialized to ensure continued accuracy of runtime estimation.
Does the stage support absolute positioning without homing?
No—optical homing is required at power-up to establish the mechanical origin; however, position retention is maintained across sleep cycles via non-volatile memory.
What is the maximum allowable vibration amplitude during operation?
Measured acceleration noise is ≤0.02 g RMS (10–100 Hz) at full load and rated speed—well below thresholds known to induce motion blur in sub-5 µm voxel CT reconstructions.
How is electromagnetic compatibility verified in proximity to X-ray generators?
Pre-compliance radiated emission testing was performed per CISPR 11 Group 1, Class B, with the stage operating adjacent to a 160 kV microfocus source; no anomalous detector readout artifacts were observed.