A new method to quantify penile erection hardness: real-time ultrasonic shear wave elastography

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Urology

Background:

• Penile erection hardness (EH) is a key indicator of erectile function.
• Current evaluation uses the semi-quantitative erectile hardness score (EHS), a graded variable.
• A continuous, quantitative method for measuring EH is needed.

Purpose of the Study:

• To introduce and validate a novel method for real-time, quantitative measurement of penile EH.
• To utilize ultrasonic shear wave elastography (SWE) for this purpose.
• To assess the correlation between tissue stiffness and erection hardness grades.

Main Methods:

• Real-time SWE was used to measure Young's modulus (YM) of the corpus cavernosum and tunica albuginea.
• Measurements were taken at rest and during induced erections in 40 patients with erectile dysfunction (ED) and 20 controls.
• A specific region of interest (ROI) was selected for automated stiffness measurement.

Main Results:

• Tunica albuginea stiffness significantly increased with erection hardness (EH) grades.
• Corpus cavernosum stiffness showed a slight decrease during erection.
• A cutoff YM of 81.60 kPa for the tunica albuginea predicted successful intercourse completion.

Conclusions:

• Tunica albuginea stiffness, measured by SWE, is a reliable quantitative indicator of penile EH.
• SWE offers an objective and continuous assessment of EH, surpassing the limitations of the EHS.
• This quantitative method allows for more accurate evaluation of ED treatments' efficacy.