What technique allows for 'virtual palpation' of a lesion?

• A. Tissue harmonic imaging
• B. Extended field of view imaging
• C. Edge enhancement
• D. Elastography

Answer: (D)

Elastography is a medical imaging technique that provides information about the stiffness or elasticity of tissues, which can be particularly useful in characterizing lesions. This technique allows for "virtual palpation," meaning it enables practitioners to assess how hard or soft a lesion is compared to surrounding tissues without physically touching it.

In elastography, ultrasound or other modalities measure the mechanical properties of tissues. When a lesion is present, its stiffness might differ from that of adjacent healthy tissue, thereby providing insights into the nature of the lesion — whether it is potentially benign or malignant. This capability is particularly beneficial in detecting and assessing tumors, where variations in stiffness can correlate with pathological changes.

Other techniques listed, such as tissue harmonic imaging or extended field of view imaging, improve the quality and scope of the imaging but do not provide specifics related to the tactile qualities of tissues. Edge enhancement focuses on improving the visibility of boundaries in images but does not provide information about the physical characteristics of lesions like elastography does.