AIDR 3D Computed Tomography


Personalized Dose Management

AIDR 3D has been developed as the next step in the evolution of noise reduction technology.

AIDR 3D, Adaptive Iterative Dose Reduction, is designed to lower radiation dose and maximize image quality all with accelerated workflow.

Integrated into SUREExposure3D settings, this iterative algorithm removes noise in the raw and image data space, by analyzing and processing the data repeatedly.

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Adaptive Iterative Dose Reduction

Lower Radiation Dose and Maximize Image Quality

Adaptive Iterative Dose Reduction, AIDR 3D, is designed to lower radiation dose and maximize image quality all with accelerated workflow.

Video Showcase Clinical Example

Evolution of AIDR

Adaptive Iterative Dose Reduction 3D (AIDR 3D) is the latest generation of Canon Medical Systems' dose reduction technology that is fully integrated into the imaging chain, and optimized for busy clinical environments.

Aquilion CT Scanner

1st Generation


Image Based Iterative
Noise Reduction Algorithm

2nd Generation


Integration into
SUREExposure 3D settings

3rd Generation


Noise Reduction in the Raw
and Image Data Space

4th Generation

AIDR 3D Enhanced

Optimized Noise Reduction, Image Texture and Number of Iterations

"The balance of image quality and radiation dose is the fundamental challenge for physicians in performing routine clinical examinations while adhering to the ALARA principle. With the integration of AIDR 3D* into SUREExposure controls, the radiation exposure is automatically reduced before the scan for the diagnostic task at hand, no matter what the size or shape of the patient."

Yasuo Nobuta,
General Manager,
CT Systems Division,
Canon Medical Systems

Adaptive and Integrated Dose Management

In order to achieve the highest quality images, with reduced dose levels, the Aquilion ONE Family implements an array of adaptive and integrated dose reduction strategies. These strategies are implemented at every stage in the scanning process from patient registration through data acquisition, raw data and image reconstruction.

AIDR 3D Patient Registration

Patient Registration

  • The system prompts the user to select the appropriate protocol based on patient age, weight and exam type
  • Dose is displayed on the console prior to scanning for operator confirmation and validation
  • Aquilion ONE includes the National Electrical Manufacturers Association (NEMA) XR-25 Dose Check requiring dose notification and alert features
AIDR 3D Acquisition


  • Integrated XYZ mA modulation is scanogram-based to automatically reduce patient dose
  • Active Collimation limits helical over-ranging, reducing dose delivered to the patient on all helical scans
  • Variable Helical Pitch** (vHP) changes the helical pitch automatically from an ECG gated to a non-ECG gated exam, saving dose, IV contrast and time
AIDR 3D Raw Data and Reconstruction

Raw Data and Reconstruction

  • Adaptive Iterative Dose Reduction (AIDR) adaptively targets image noise, this iterative process can be used to lower patient dose while maintaining spatial resolution and image texture
  • Quantum Denoising Software (QDS) reduces image noise to optimize image quality while lowering patient dose
  • Boost 3D™ improves image quality and lowers dose by selectively reducing noise and streak artifacts from those areas where it is needed

Active Collimation

In Helical scanning, exposure is needed before the start and after the end of the planned scan range in order to reconstruct images at these positions. This over-ranging requires at least one extra rotation, although only a small portion of this data is utilized. Active collimation synchronizes the width of the X-ray beam at the ends of the scan range to the clinically useful area needed for image reconstruction. By eliminating exposure that is not used for diagnosis, patient dose can be reduced.

Active Collimation Demo
AIDR 3D Active Collimation