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The oscilloscope to speed up MRI methods development

Dynamic Field Camera

  • Dynmaic Field Camera with positioning unitDetermine complext models of gradient and shim behavior
  • Speed up sequence development
  • Enable novel image reconstruction based on actual k-space trajectories

Brain image: multi-shot spiral
multi-shot spiral

Enable novel image reconstruction methods
Gradient encoding is the principal encoding mechanism in MRI. Deviations from ideal gradient fidelity often limit the achievable image quality, and in particular when using demanding image reconstruction methods. The Dynamic Field Camera allows the direct measurements of the encoded k-space trajectory. By incorporating the measured trajectory to your image reconstruction software, the achievable image quality and robustness can be substantially improved, ultimately enabling new MR applications.

measured k-space trajectory (SSFP-sequence)
measured k-space trajectory (SSFP-sequence)

Speed up sequence development
The development of novel MR sequences is commonly hampered by unwanted gradient behavior or programming errors, which are cumbersome to elucidate. With the Dynamic Field Camera it is possible to measure the actual gradient evolution and instantly visualize all measured sequence gradients. This visualization of gradient dynamics expedites the debugging process without the need for implementing additional pulse sequences, dramatically reducing the duration to successfully implement new MR methods.

measured k-space trajectory (variable density spiral)
measured k-space trajectory (variable density spiral)

Improved calibration of gradient and shim systems
Incomplete or inaccurate gradient system calibration (i.e. pre-emphasis) can lead to artifacts in images that can limit their diagnostic value. The Dynamic Field Camera allows for direct, fast, and accurate characterization of a gradient system (e.g. full frequency response, higher-order field dynamics, etc). This enables the development of new and improved calibration methods, whereby the increased system performance can optimally leverage the available MR system.

Dynamic Field Camera

Physical dimensions
Dynamic Field Camera - Site Overview
Dynamic Field Camera – Site Overview
Housing (w x d x h), incl. base 75 cm x 28 cm x 31 cm
Cable diameter 3 cm
Coaxial cables custom fit, < 20 m
NMR field probes
Coherence lifetime > 100 ms
Minimum repetition time 500 ms
SNR∙√BW 80‘000
Achievable kmax ±7800 rad/m

Field Measurements

Data types Unit Temporal resolution
Gradients [mT/m]  1 µs
B0 [mT]  1 µs
k-space values [rad/m] and k0 [rad]  1 µs
k-higher order up to 3rd spatial order  1 µs
Bfit, Gfit fitted field value for each interleave/dynamic

Camera Acquisition System

Skope Camera Acquisition SystemThe field sensor signals of the Dynamic Field Camera are acquired by the 16-channel Skope Camera Acquisition System and automatically processed to provide the actual magnetic field dynamics.

skope-fx, field explorer software

skope-fx - Graphical user interface
skope-fx – Graphical user interface

The skope-fx software controls the acquisition and processing of the field data, and allows for a fast and easy visualization.

  • Compare changes of k-space trajectory
  • Analyze time series
  • Parametric view (kx vs. ky , kx vs. kz or ky vs. kz)
  • Spectral view
  • Logarithmic plot
  • Detrend data
  • Filter data

Positioning Unit

The Positioning Unit allows for a rigid mounting of the Dynamic Field Camera on the patient bed and enables the height- and orientation-adjusting of the Dynamic Field Camera.

Terms of Use