Homemade Ultrasound Stand-Off Gel Pads: A Multi-Parameter Performance Study

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Materials Science

Background:

• Clinical ultrasound imaging often relies on sterile, commercially produced stand-off gel pads.
• These commercial pads can represent a significant cost in healthcare settings.
• Exploring natural, low-cost alternatives is crucial for improving accessibility and reducing healthcare expenses.

Purpose of the Study:

• To evaluate the performance and safety of homemade stand-off gel pads crafted from natural ingredients.
• To compare the mechanical properties, moisture retention, contamination rates, and image quality of aloe vera, xanthan gum, and cucumber-based pads.
• To determine the feasibility of these natural alternatives in clinical ultrasound applications.

Main Methods:

• Thirty stand-off gel pads were prepared using aloe vera, xanthan gum, and cucumber.
• Mechanical failure was assessed using tensile strength testing.
• Moisture loss was quantified to determine drying rates.
• Microbial contamination was evaluated via colony counting.
• Image quality was objectively measured using a chicken breast phantom.

Main Results:

• Significant differences were observed in compressive force resistance (p=0.044), with xanthan gum pads requiring higher force than cucumber pads (p=0.047).
• Moisture loss varied significantly (p<0.001), with aloe vera showing higher loss (9.65%±0.15%) than xanthan gum (5.94%±0.11%) and cucumber (5.81%±0.11%).
• Axial resolution (p=0.037), lateral resolution (p=0.029), and parenchymal striations were significantly different, with speckle artifacts noted in xanthan gum pads.

Conclusions:

• Cucumber stand-off gel pads present a practical and viable alternative for clinical ultrasound imaging.
• These pads exhibit favorable structural integrity, effective moisture retention, and low microbial contamination.
• The image quality achieved with cucumber pads is comparable to conventional methods, suggesting their suitability for medical use.