Strokes are the second leading cause of death worldwide. Vulnerable carotid plaques are a primary cause of stroke, with carotid Intraplaque Haemmorrghages being a key feature of vulnerability. MR imaging, which is sensitive to the presence of endogenous Methemoglobin (MetHb), is used to detect IPH. MRI is however expensive, and not readily available. We propose the use of Photoacoustic Imaging (PAI) for the detection of IPH, with MetHb being the primary PA imaging target. I examine the feasibility of this approach by performing Monte Carlo studies of light propagation, energy deposition and PA generation in tissuemimicking models, as well as experimental PA measurements of MetHb in tissue-mimicking phantoms. I show that is possible to achieve an SNR of ∼50dB at the average carotid artery depth of ∼21mm, with the possibility of imaging up to ≥ 32mm in Type I skin using commonly available hardware.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.