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Photoacoustic Imaging (PAI) (CAT#: STEM-PET-0013-WXH)

Introduction

PhotoAcoustic (or optoacoustic) Imaging (PAI) is a novel but well-established technology that combines optical and ultrasound imaging. Photoacoustic imaging can reliably detect regions with high optical absorption which means diseased tissue can be imaged with high contrast in the presence of surrounding healthy tissue. When combined with ultrasound, the photoacoustic image can be visualized in the context of the ultrasound image.




Principle

Briefly, the technique detects endogenous or exogenous chromophores that are excited through an illumination carried out with pulsed laser light, typically in the Red-NIR range. The non-radiative release of the absorbed energy produces a microheating and a thermoelastic expansion in the chromophore close surrounding, which can generate ultrasound. The acoustic waves are detected by a transducer and transformed into an image.

Applications

• Oncology (cancer detection, assessment of vascular volume and hypoxia, targeting experiments, assessment of drug distribution and therapy outcome)
• Neurobiology (stroke, brain cancer, intracranial injection of drugs, functional imaging)
• Cardiovascular biology (heart attack, detection of atherosclerotic plaques, hemodynamic and O2 perfusion)
Developmental biology (vascular volume and oxygenation of placenta, image-guided embryo injection, fetal analysis)
• Abdomen analysis (kidney diseases as renal microcirculation flow, renal obstruction analysis, gastrointestinal motility, organs’ perfusion)
• Skin analysis (mainly detection of melanin in melanoma cells)
• Image-guided injection of drug

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