Imaging with Ultrasounds

What determines the length of an ultrasound pulse?

What happens to the transducer when the polarity of the voltage changes?

What is the wavelength of the emitted ultrasound a function of?

What happens to the pressure changes caused by the returning ultrasound echoes?

What type of material are transducers typically made of?

What is the basis of measuring distance in diagnostic imaging?

What is the average speed of sound in soft tissue?

What is the rule that applies when sound travels through soft tissue?

What is the formula to calculate the depth of a reflector?

How far from the transducer are the interfaces in the given class example?

What is the main reason for differences in acoustic impedance in different tissues?

What determines the brightness of the image in ultrasound imaging?

What is the method used to determine the reflector's depth in ultrasound imaging?

What is the term for the elapsed time from pulse creation to pulse reception in ultrasound imaging?

What is the purpose of the transducer in ultrasound imaging?

What property do piezoelectric crystals have?

What is the result of an alternating voltage applied to a piezoelectric crystal?

What determines the resonant frequency of an ultrasound transducer?

What happens when a sound wave causes a piezoelectric crystal to vibrate?

What is the main function of an ultrasound transducer?

What is the process of creating piezoelectric properties in a material called?

What is the temperature at which PZT is polarized called?

What happens to the piezoelectric properties of PZT when it is heated above the Curie temperature?

How does the speed of sound in PZT affect the frequency of the sound created?

What is the range of the speed of sound in most piezoelectric materials?

How does the thickness of the PZT crystal affect the frequency of the sound created?

What is the mathematical relationship between frequency and PZT thickness?

What range of thicknesses is typically used for PZT crystals in diagnostic imaging transducers?

Why do transducer manufacturers create PZT crystals of varying thickness?

What is the purpose of controlling the thickness of PZT crystals in transducer design?

What is the function of the transducer in ultrasound imaging?

What determines the width of the organ at a given point?

What is the purpose of applying a high-amplitude voltage to the transducer?

What determines the field of view of a transducer?

What is the dimension of the organ along the ultrasound pulse's path?

What is the formula to calculate the distance traveled by the ultrasound pulse?

What is the purpose of mapping the echo magnitude in an ultrasound image?

What is the relationship between the time interval and the distance traveled by the ultrasound pulse?

What is the total distance traveled by the pulse if the go-return time is 26 μs?

What does the operator change when changing the image depth?

What is the effect of a smaller transducer diameter on the near field?

What is the effect of increasing the transducer diameter on the focal depth?

Why do higher frequency ultrasound waves produce better resolution of small structures?

What is the trade-off when increasing the frequency in ultrasound imaging?

What is the process called when an array of piezoelectric elements electronically steers and focuses acoustic pulses through the plane or volume being imaged?

Why do transducer manufacturers create small diameter, high frequency crystals?

What is the purpose of beamsteering in phased array transducers?

What is the mathematical relationship between diameter, frequency, and focal depth?

What is the advantage of using phased array transducers over unfocused transducers?

What is the difference between mechanical focus and unfocused transducers?

What is the beam diameter at the focus?

What happens to the sound beam in the far zone?

How are all diagnostic transducers focused?

What is the distance from the transducer to the focus called?

What happens to the beam diameter at a depth that is twice the focal length?

What is the primary reason for the attenuation of ultrasound signals with increasing frequency?

What is the purpose of time gain compensation (TGC) in ultrasound imaging?

How does the frequency of the ultrasound wave affect the resolution of the image?

What is the primary function of the receiver in ultrasound imaging?

What determines the shape of the ultrasound beam produced by the transducer?

What is the advantage of using higher frequencies in ultrasound imaging?

What determines the axial resolution in ultrasound imaging?

What is the effect of increasing the transducer frequency on the axial resolution?

Why are higher frequencies used in breast ultrasound imaging compared to abdominal imaging?

What is the advantage of introducing the transducer into the body near the tissues to be imaged?

Why does a higher frequency pulse produce better lateral resolution in the far field?

What is the effect of a larger transducer diameter on the near field?

What is the advantage of phased array transducers over unfocused transducers?

What is the mathematical relationship between diameter, frequency, and focal depth?

What is the purpose of beamsteering in phased array transducers?

What is the effect of increasing the frequency on image quality?

What is the advantage of using mechanical focus over unfocused transducers?

What is the relationship between transducer diameter and near field length?

What determines the field of view of a transducer?

What is the purpose of focusing the ultrasound beam?

What is the effect of a larger transducer diameter on the ultrasound beam?

Which of the following probes creates a beam with the least divergence?

What is the primary method of focus in ultrasound imaging?

What is the mathematical relationship between the frequency and the diameter of the transducer in determining the beam's focal depth?

What is the advantage of using a higher frequency transducer in ultrasound imaging?