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What are the three components of the penumbra? - geometry, transmission, and lateral scattering Geometric Penumbra - is due to the finite source size. It is more of a concern in Co-60 machines where the source is between 1 and 2 cm in size. Transmission Penumbra - is due to the transmission of ph...

Cells are most resistant in which phase? - S With regard to Energy, Depth, Field Size, and SSD; Do PDD's increase or decrease? - increase, decrease, increase, increase Which is the resting phase after synthesis (S), but before mitosis (M)? - G2 The cummulative effective dose limit for a radiati...

It is discovered that a patient receiving 400 cGys daily has been given 25 fractions at 77 cm SSD instead of 80 cm SSD. Instead of the prescribed 10,000 cGy, the patient received: a. 9,264 cGy b. 9,628 cGy c. 10.390 cGy d. 10,794 cGy - d. 10,794 cGy If treating a supine patient isocentrically ...

What term best describes a major influence on image resolution for most CT scanners: - Voxel Photon Energy Formula - E=hv=hc/wl E=hf=hc/wavelength(lambda) h=Planck constant = 6.6261x10^-34 JS Speed of light = 3e8 f=photon frequency lambda = photon wavelength Which instrument would be the mos...