Physics of Breast Ultrasound/Misc.
Questions and Answers Latest Version
Already Passed
What is the main reason for using high-frequency transducers in breast ultrasound?
✔✔They provide better resolution for superficial structures.
What is the role of tissue impedance in ultrasound imaging?
✔✔Tissue impedance affects how much sound is reflected back to the transducer, helping to
create an image.
Why is it important to adjust the gain during a breast ultrasound exam?
✔✔To ensure the image contrast is optimized and important structures are visible.
How does sound wave frequency impact penetration in breast ultrasound?
✔✔Higher frequencies provide better resolution but less penetration, while lower frequencies
penetrate deeper but with lower resolution.
What does the term "acoustic impedance" refer to in breast ultrasound?
1
,✔✔It refers to the resistance a tissue offers to the passage of ultrasound waves, influencing
reflection and transmission.
What is the function of the gel used in breast ultrasound?
✔✔The gel serves to eliminate air between the skin and transducer, improving sound wave
transmission.
What effect does tissue density have on ultrasound imaging?
✔✔Denser tissues tend to reflect more sound waves, appearing brighter (hyperechoic), while less
dense tissues appear darker (hypoechoic).
How does posterior acoustic enhancement occur in breast ultrasound?
✔✔It occurs when an anechoic or fluid-filled structure transmits sound waves effectively,
leading to increased brightness behind the structure.
What is the primary function of a Doppler ultrasound in breast imaging?
✔✔To evaluate blood flow within a lesion, helping to assess whether it is benign or malignant.
How does the angle of insonation affect Doppler ultrasound results?
2
, ✔✔If the ultrasound beam is not aligned with the blood flow, it can lead to inaccurate flow
velocity readings.
Why is a linear array transducer typically used in breast ultrasound?
✔✔Its high frequency allows for excellent resolution of superficial tissues, which is ideal for
breast imaging.
What role does the "beam profile" play in breast ultrasound?
✔✔The beam profile determines the shape of the ultrasound beam, affecting how sound waves
interact with tissues and influencing image quality.
Why is tissue stiffness assessed in breast ultrasound elastography?
✔✔Because malignant tissues tend to be stiffer than benign tissues, providing additional
diagnostic information.
How does frequency affect the axial resolution in breast ultrasound?
✔✔Higher frequencies improve axial resolution, allowing for better differentiation of closely
spaced structures.
3
Questions and Answers Latest Version
Already Passed
What is the main reason for using high-frequency transducers in breast ultrasound?
✔✔They provide better resolution for superficial structures.
What is the role of tissue impedance in ultrasound imaging?
✔✔Tissue impedance affects how much sound is reflected back to the transducer, helping to
create an image.
Why is it important to adjust the gain during a breast ultrasound exam?
✔✔To ensure the image contrast is optimized and important structures are visible.
How does sound wave frequency impact penetration in breast ultrasound?
✔✔Higher frequencies provide better resolution but less penetration, while lower frequencies
penetrate deeper but with lower resolution.
What does the term "acoustic impedance" refer to in breast ultrasound?
1
,✔✔It refers to the resistance a tissue offers to the passage of ultrasound waves, influencing
reflection and transmission.
What is the function of the gel used in breast ultrasound?
✔✔The gel serves to eliminate air between the skin and transducer, improving sound wave
transmission.
What effect does tissue density have on ultrasound imaging?
✔✔Denser tissues tend to reflect more sound waves, appearing brighter (hyperechoic), while less
dense tissues appear darker (hypoechoic).
How does posterior acoustic enhancement occur in breast ultrasound?
✔✔It occurs when an anechoic or fluid-filled structure transmits sound waves effectively,
leading to increased brightness behind the structure.
What is the primary function of a Doppler ultrasound in breast imaging?
✔✔To evaluate blood flow within a lesion, helping to assess whether it is benign or malignant.
How does the angle of insonation affect Doppler ultrasound results?
2
, ✔✔If the ultrasound beam is not aligned with the blood flow, it can lead to inaccurate flow
velocity readings.
Why is a linear array transducer typically used in breast ultrasound?
✔✔Its high frequency allows for excellent resolution of superficial tissues, which is ideal for
breast imaging.
What role does the "beam profile" play in breast ultrasound?
✔✔The beam profile determines the shape of the ultrasound beam, affecting how sound waves
interact with tissues and influencing image quality.
Why is tissue stiffness assessed in breast ultrasound elastography?
✔✔Because malignant tissues tend to be stiffer than benign tissues, providing additional
diagnostic information.
How does frequency affect the axial resolution in breast ultrasound?
✔✔Higher frequencies improve axial resolution, allowing for better differentiation of closely
spaced structures.
3
