Individual transducer impulse response characterization method to improve image quality of array-based handheld...

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Acoustic Physics

Background:

• Transducer element properties critically impact optoacoustic (photoacoustic) tomography image quality.
• Current impulse response correction methods assume uniform transducer characteristics, which is not realistic.
• Element-to-element variability in electrical impulse responses (EIRs) within transducer arrays is not well-understood regarding its effect on image quality.

Purpose of the Study:

• To develop a robust method for deriving individual electrical impulse responses (EIRs) for each transducer element in an array.
• To investigate the impact of element-to-element EIR variability on image quality in optoacoustic tomography.
• To improve image resolution and clinical applicability of array-based handheld optoacoustic transducers.

Main Methods:

• Proposed a method for robust EIR derivation using sparse measurements of the total impulse response (TIR).
• Solved a linear system for temporal convolution to determine individual EIRs.
• Combined simulated spatial impulse response with derived individual EIRs to create an individual synthetic TIR for full characterization.

Main Results:

• Successfully derived individual EIRs for transducer elements in an array.
• Demonstrated significant improvement in isotropic resolution after correcting for individual transducer responses.
• The proposed method accounts for element-to-element variability, unlike previous approaches.

Conclusions:

• Accurate characterization of individual transducer EIRs is crucial for high-quality optoacoustic imaging.
• The developed method effectively addresses element-to-element variability, leading to enhanced image resolution.
• This technique holds promise for advancing clinical applications of array-based handheld optoacoustic tomography systems.