Parallel RF Saturation for CEST MRI Imaging Speed
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Solution Overview
Problem
Current CEST MRI methods require lengthy preparation processes and multiple image acquisitions to achieve high-resolution images with high signal-to-noise ratio, disrupting the steady state of RF saturation and necessitating repeated preparation, thus extending imaging time.
Innovation Solution
Performing RF irradiation and data acquisition in parallel, maintaining a steady state of labile proton saturation using a SSFP-FID pulse sequence, and removing magnetization transfer effects to obtain CEST images efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CEST MRI uses a preparation process of repeatedly applying RF to labile proton until saturation of water proton reaches steady state, then image information of target matter can be obtained, but the entire time to capture an image is extended
Solution Approach 1:
The patent applies continuous RF irradiation to maintain labile proton saturation throughout the imaging process rather than using discrete preparation pulses. The RF irradiation unit continuously saturates the labile proton while the imaging unit acquires images, eliminating idle preparation time and maintaining steady-state saturation continuously throughout the imaging sequence.
Solution Approach 2:
The patent performs preliminary saturation of the labile proton using RF irradiation before and during the imaging process. By pre-establishing the saturation state and maintaining it through continuous RF application, the system ensures that water proton saturation is already achieved when imaging begins, eliminating the need for repeated preparation processes.
2Measurement precision
If image information is obtained several times to achieve high resolution or high signal-to-noise ratio, then image quality is improved, but the steady state of CEST effect is disturbed and new preparation process is needed
Solution Approach 1:
The continuous RF irradiation maintains labile proton saturation throughout multiple image acquisitions, preventing disturbance of the steady state. The RF irradiation unit operates continuously during the entire imaging sequence, ensuring that saturation is replenished immediately after each image acquisition without requiring re-preparation.
Solution Approach 2:
The system monitors the saturation state of water protons and adjusts RF irradiation parameters to maintain steady-state saturation. By implementing feedback control, the system detects when saturation levels drop and automatically compensates by adjusting RF power or duration to restore the steady state, enabling multiple acquisitions without re-preparation.
3Productivity
If RF irradiation and data acquisition are performed in parallel, then imaging time is reduced, but maintaining steady state becomes more complex
Solution Approach 1:
The patent merges the RF irradiation function and imaging acquisition function into a single integrated operation. The RF irradiation unit and imaging unit work simultaneously in parallel, with the RF irradiation continuing throughout the entire imaging sequence rather than being separated into distinct preparation and imaging phases. This integration simplifies the control logic by eliminating the need for sequential coordination between separate preparation and imaging steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces imaging time by a factor of five or more, enhances image contrast, and facilitates accurate disease diagnosis, such as cancer, without the need for repeated preparation processes.
Implementation Method 1
saturating a labile proton by radiating a first RF pulse signal to an object
Implementation Method 2
a chemical exchange occurs between a proton of water and a proton of a target matter or object
Implementation Method 3
Magnetic resonance imaging (MRI) refers to technology for obtaining an anatomical tomographic image of a human being
Data Source
AI summary
Disclosed is an image acquisition method and apparatus using a parallel scheme of radio frequency irradiation and data acquisition. The image acquisition method includes saturating a labile proton by radiating a first radio frequency (RF) pulse signal to an object, generating a proton signal by radiating a pulse sequence signal to the object, and obtaining a chemical exchange saturation transfer (CEST) image of the object, and the generating and the obtaining of which are repeatedly performed in parallel.