Introduction:
The MR-SPECTROMETER (Magnetic Resonance Spectrometer) is a high-performance, multi-channel transmit-receive signal processor designed for Magnetic Resonance (MR) Spectroscopy. It generates transmit (Tx) signals as defined by a pulse sequence generation (PSG) module in the standard “pulseq” format and receives multi-channel echo (Rx) signals. Both Tx and Rx functions are implemented digitally, ensuring high-speed, high-precision operation. Echo signals are transferred over high-speed Ethernet in k-space format.
At its core, MR-SPECTROMETER features a high-speed processor managing timing, mixed-signal generation/acquisition, and signal pre-processing. It includes, Multiple ADCs for Rx, High-speed DAC for Tx RF generation, Precision DACs for gradient waveform generation.
Block Diagram:
Specifications:
| Parameter | Specification |
| MR Centre Frequency | 1MHz to 200MHz |
| Tx, RX Signal Bandwidth | Up to 3 MHz |
| No. of Tx RF Outputs | Up to 4 (Analog), 16bit resolution |
| Nominal Tx RF level | 0dBm |
| Tx RF output impedance | 50W, Single Ended |
| Tx RF output SFDR | 70dBFS (Minimum) |
| Tx RF Output Update Rate | 500MSPS |
| No. of Gradient outputs | 3 (Analog), 20bit resolution |
| Gradient output level | 10Vp-p Full Scale |
| Gradient output impedance | 50W, Differential |
| Gradient output bandwidth | 500KHz |
| No. of Rx Input Channels | 8 (analog), 16bit resolution Scalable in multiple of 8 i.e. 16, 32, 48,.…128. |
| Rx Input Channel Full Scale | 1Vpp |
| Rx Input Channel Impedance | 50W, Single Ended |
| Rx Input Channel Prog. Gain | -11dB to +34dB in 112 steps |
| Tx, Rx Frequency Stability | 3ppb |
| Data Interface (PSG, k-Space) | GbE |
| Host Computing Platform | MS-Windows 10 or 11 |
| Unit Dimensions | 483 mm * 176 mm * 500 mm |
| Unit Weight | 11kg |
| Unit Power Supply Input | 24VDC, 75Watt |
MR-SPECTROMETER Unique Features:
- Accurate Tx signal generation and high-fidelity Rx acquisition
- Supports SE, GRE pulse sequences (others on demand)
- Includes CDAC IMRI software and SAMEER embedded software
- Fully configurable via user software
- Compatible with pulseq (PSG) and ISMRMD (k-space) formats
- API for custom MR application development
- Parallel transmit possible
- High-speed signal processing (DDS and DDC)
- Built-in diagnostics, monitoring, and logging
- Scalable and modular architecture
Typical Applications:
- Clinical MRI Systems
- MR Spectroscopy in material analysis
- Research and Development in Magnetic Resonance
- Radiology Training and Education
Tx Gradient Waveforms (Differential):
Tx RF Waveform and Spectrum:
