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Optoacoustic imaging of the prostate: development toward image-guided biopsy

机译：前列腺的光声成像：向图像引导活检的发展

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摘要

Optoacoustic (OA) tomography has demonstrated utility in identifying blood-rich malignancies in breast tissue. We describe the development and characterization of a laser OA imaging system for the prostate (LOIS-P). The system consists of a fiber-coupled Q-switched laser operating at 757 nm, a commercial 128-channel ultrasonic probe, a digital signal processor, and software that uses the filtered radial back-projection algorithm for image reconstruction. The system is used to reconstruct OA images of a blood-rich lesion induced in vivo in a canine prostate. OA images obtained in vivo are compared to images acquired using ultrasound, the current gold standard for guiding biopsy of the prostate. Although key structural features such as the urethra could be identified with both imaging techniques, a bloody lesion representing a highly vascularized tumor could only be clearly identified in OA images. The advantages and limitations of both forward and backward illumination modes are also evaluated by collecting OA images of phantoms simulating blood vessels within tissue. System resolution is estimated to be 0.2 mm in the radial direction of the acoustic array. The minimum detectable pressure signal is 1.83 Pa. Our results encourage further development toward a dual-modality OA∕ultrasonic system for prostate imaging and image-guided biopsy.
机译：声光（OA）断层扫描已证明可用于识别乳房组织中血液丰富的恶性肿瘤。我们描述了激光OA前列腺成像系统（LOIS-P）的发展和特征。该系统由工作在757 nm的光纤耦合Q开关激光器，商用128通道超声探头，数字信号处理器以及使用滤波后的径向反投影算法进行图像重建的软件组成。该系统用于重建犬前列腺中体内诱导的富血病变的OA图像。将体内获得的OA图像与使用超声获得的图像进行比较，超声是目前用于指导前列腺活检的金标准。尽管可以使用两种成像技术来识别关键结构特征（例如尿道），但只能在OA图像中清楚地识别出代表高度血管化肿瘤的血性病变。还可以通过收集模拟组织内血管的体模的OA图像来评估前向和后向照明模式的优缺点。在声学阵列的径向方向上，系统分辨率估计为0.2毫米。最小可检测压力信号为1.83 Pa。我们的结果鼓励进一步发展用于前列腺成像和图像引导活检的双模式OA超声系统。

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