Medical Physics Quiz

Directing ultrasound waves into the body to obtain diagnostic information about internal structures

Producing radioisotopes

Injecting a tracer into a vein to produce an image

Using X-rays to image internal body structures

To detect gamma rays during a PET scan

To generate ultrasound waves

To calculate the attenuation of X-rays in matter

To produce a 3D image of an internal structure by combining multiple X-ray images

Refraction

Scattering

Reflection

Absorption

By applying a p.d. across a piezo-electric crystal

Using a crystal that scintillates and a photomultiplier

By rotating anode and vacuum

By using a piezoelectric transducer

To prevent reflection of ultrasound waves at the skin

To increase the attenuation of ultrasound waves

To generate ultrasound waves

To match the impedance of the skin and reduce reflection

Z = ρ, where ρ is the density of the medium

Z = ρc, where c is the speed of sound in the medium

Z = α, where α is the absorption coefficient

Z = c, where c is the speed of sound in the medium

𝐼𝑟/𝐼0=𝑍1+𝑍2𝑍1+𝑍2^2

𝐼𝑟/𝐼0=𝑍1+𝑍2𝑍1−𝑍2^2

𝐼𝑟/𝐼0=𝑍1−𝑍2𝑍1+𝑍2^2

𝐼𝑟/𝐼0=𝑍2−𝑍1𝑍2+𝑍1^2

𝒇𝒎𝒂𝒙= 𝒆𝑽𝒉

𝑬𝒎𝒂𝒙=𝒉𝒇𝒎𝒂𝒙

𝑬𝒏𝒆𝒓𝒈𝒚 𝒐𝒇 𝒑𝒉𝒐𝒕𝒐𝒏=𝑬𝒄

𝑬𝒏𝒆𝒓𝒈𝒚 𝒐𝒇 𝒑𝒉𝒐𝒕𝒐𝒏=𝒉𝒇