MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED
GUIDE.
High dose rate (HDR) remote afterloading can be used to treat which of the following sites?
1. glioblastoma
2. leukemia
3. Hodgkin's lymphoma
4. cervix
4. cervix
Lipowitz metal is used in place of lead to make custom shielding blocks for which reason?
1. provides a sharper beam edge
2. requires less block thickness
3. produces lighter blocks
4. has a lower melting point
4. has a lower melting point
To dose of which area would be of dosimetric concern when using an electron beam for total skin
irradiation?
1. cord
2. finger nails
3. hair
4. sternum
2. finger nails
Prior to brachytherapy remote afterloading treatment administration, what is required?
1. preparation of an oral directive
2. verification of the patient identity by one method
3. independent confirmation of treatment time
4. single check of output parameters
3. independent confirmation of treatment time
The correct source-to-tray distance on the machine is 50cm. If a block is constructed with a tray
distance of 40cm, what will result?
1. blocked area will be too small
2. block could be in the wrong tray position
3. block divergence will not match the beam divergence
4. block will be too far from the patient
, 1. blocked area will be too small
The most significant effect of an air cavity in a MV beam treatment is?
1. a change in the spectral energy distribution within the cavity
2. increased photon transmission through the cavity
3. enhanced absorption of dose in and beyond the cavity
4. partial gain of electronic equilibrium at the cavity interface
2. increased photon transmission through the cavity
When treating the posterior cervical lymph nodes of a patient whose lateral separation measures 12
cm, the energy of the electrons needed to provide an adequate dose to the lymph nodes at a depth of
3 cm while sparing the spinal cord is what?
1. 6 MeV
2. 9 MeV
3. 15 MeV
4. 18 MeV
2. 9 MeV
When treating a breast tumor, scattered dose to the opposite breast can be reduced by?
1. using a beam splitter in the tangent fields
2. adding bolus to the treated breast
3. reducing the amount of lung in the tangent fields
4. eliminating the wedge in the medial field
4. eliminating the wedge in the medial field
Once a treatment plan has been generated the Qualified Medical Dosimetrist is responsible for
communicating the plan to the Licensed Practitioner, and then to _________ for implementation.
1. radiation therapist
2. senior certified medical dosimetrist
3. radiology department director
4. qualified medical physicist
1. radiation therapist
The most significant factor effecting calculation of dose with tissue inhomogeneity correction is?
1. energy of the beam
2. size of inhomogeneity
3. depth of inhomogeneity
2. size of inhomogeneity
GUIDE.
High dose rate (HDR) remote afterloading can be used to treat which of the following sites?
1. glioblastoma
2. leukemia
3. Hodgkin's lymphoma
4. cervix
4. cervix
Lipowitz metal is used in place of lead to make custom shielding blocks for which reason?
1. provides a sharper beam edge
2. requires less block thickness
3. produces lighter blocks
4. has a lower melting point
4. has a lower melting point
To dose of which area would be of dosimetric concern when using an electron beam for total skin
irradiation?
1. cord
2. finger nails
3. hair
4. sternum
2. finger nails
Prior to brachytherapy remote afterloading treatment administration, what is required?
1. preparation of an oral directive
2. verification of the patient identity by one method
3. independent confirmation of treatment time
4. single check of output parameters
3. independent confirmation of treatment time
The correct source-to-tray distance on the machine is 50cm. If a block is constructed with a tray
distance of 40cm, what will result?
1. blocked area will be too small
2. block could be in the wrong tray position
3. block divergence will not match the beam divergence
4. block will be too far from the patient
, 1. blocked area will be too small
The most significant effect of an air cavity in a MV beam treatment is?
1. a change in the spectral energy distribution within the cavity
2. increased photon transmission through the cavity
3. enhanced absorption of dose in and beyond the cavity
4. partial gain of electronic equilibrium at the cavity interface
2. increased photon transmission through the cavity
When treating the posterior cervical lymph nodes of a patient whose lateral separation measures 12
cm, the energy of the electrons needed to provide an adequate dose to the lymph nodes at a depth of
3 cm while sparing the spinal cord is what?
1. 6 MeV
2. 9 MeV
3. 15 MeV
4. 18 MeV
2. 9 MeV
When treating a breast tumor, scattered dose to the opposite breast can be reduced by?
1. using a beam splitter in the tangent fields
2. adding bolus to the treated breast
3. reducing the amount of lung in the tangent fields
4. eliminating the wedge in the medial field
4. eliminating the wedge in the medial field
Once a treatment plan has been generated the Qualified Medical Dosimetrist is responsible for
communicating the plan to the Licensed Practitioner, and then to _________ for implementation.
1. radiation therapist
2. senior certified medical dosimetrist
3. radiology department director
4. qualified medical physicist
1. radiation therapist
The most significant factor effecting calculation of dose with tissue inhomogeneity correction is?
1. energy of the beam
2. size of inhomogeneity
3. depth of inhomogeneity
2. size of inhomogeneity
