Ultrasound elastography as a tool for imaging guidance during prostatectomy: initial experience

Area of Science:

• Medical Imaging
• Surgical Technology
• Urology

Background:

• Laparoscopic and robotic prostatectomy lack tactile feedback, hindering precise excision sizing.
• Ultrasound elastography (USE) maps tissue stiffness, offering a potential solution for intraoperative guidance.
• This study evaluates USE as a tactile equivalent for image-guided robotic prostatectomy.

Purpose of the Study:

• To assess Ultrasound Elastography (USE) as a tool to provide tactile feedback during robotic assisted laparoscopic prostatectomy.
• To compare the efficacy of USE against manual palpation in detecting simulated lesions.
• To evaluate USE's ability to differentiate tissue characteristics in ex-vivo prostate specimens.

Main Methods:

• Comparative study using a laparoscopic ultrasound probe on phantoms with manual palpation and USE (N=25 participants).
• Evaluation of USE on ex-vivo human prostate specimens (N=6) to identify hard vs. soft lesions, validated by pathology and MRI.
• Participants assessed lesion presence, size, and depth in the phantom study.

Main Results:

• USE demonstrated higher accuracy (84%) and specificity (74%) in tumor detection compared to manual palpation.
• USE provided more accurate estimations of tumor diameter and depth.
• USE consistently identified lesions in ex-vivo prostate specimens, distinguishing between hard/soft and malignant/benign tissues.

Conclusions:

• Ultrasound elastography (USE) is a promising tool for intraoperative palpation-equivalent evaluation during prostatectomy.
• USE can assist surgeons in determining tumor location, boundaries, and extra-capsular extension.
• Further in-situ testing in a robotic laparoscopic environment is warranted based on these findings.