MDCb

This document includes practice exam questions for the MDCB exam, covering key concepts, procedures, and knowledge areas required for successful certification. All questions are paired with correct answers, making it a useful resource for focused review and exam preparation

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE. A What is the approximate density of healthy lung tissue? A. 0.30 g/cc B. 0.95 g/cc C. 1.00 g/cc D. 1.03 g/cc B 2. The accelerator component that injects electrons into the linear accelerator is: A. a klystron. B. an electron gun. C. a bending magnet. D. a thyratron. D The equivalent square of a rectangular field of dimensions X xY is: A. The square root of 4 x X x Y B. 2 x (X x Y) C. (4 x X x Y) / (X + Y) D. 2 x (X x Y) / (X + ...

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE. WAN stands for: A. Wide Area Network B. World Area Network C. Wide Artificial Network D. Wide Access Network A Field uniformity can be checked by measuring: A. field size dependence of output B. beam output C. flatness & symmetry D. light field coincidence against gantry angulation C The isocenter of a clinical linac can be checked by: A. optical means B. mechanical means C. radiation means D. all of the a...

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE. When an enface electron beam is used for chest wall irradiation, which of the following described the dose at the interface between the chest wall and lung? A. decreased due to reduced scatter from the lung B. decreased due to irregular surface contour effects C. increased due to an increase in the electron fluence D. increased due to a larger angle of electron scatter E. unchanged from that in a homogeneous phantom A A beam deg...

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE. A patient receiving treatment to the head and neck region has experienced a skin reaction and mucositis at a total dose much lower than anticipated. The radiation oncologist requests an evaluation of the treatment. Which of the following steps should be taken? A. recalculate the treatment plan B. ensure that the depth dose, build-up region, wedge parameters, and other pertinent information for the treatment unit are correct C. review th...

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE. Is the dipeptide soluble in water (base your answer on the properties of the side chains, not the NH3+ and CO2- groups on the ends of the dipeptide)? No Which level of protein structure relies exclusively on interactions between peptide groups? Secondary Where would you expect to find a dipeptide with R groups (side chains), in the cell? Cytoplasm Sickle cell anemia is caused by a mutation in the gene encoding Beta-globin. This mutation ca...

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE. electronegativity is larger/smaller with a greater number of electrons in the shell. smaller electronegativity us lager/smaller with a greater number of protons in a given period. larger List 4 pairs of 2 atoms that will create a polar covalent bond using H, C, O, N C-O, H-O, N-H, C-N In the box below, indicate what is wrong, if anything, with the following statement. If it is correct, write "nothing, it is correct". If it is incorre...

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE. Which site has been shown to have the smallest setup and alignment discrepancy? 1. brain 2. head and neck 3. extremities 4. pelvis 2. head and neck What is the term that defines radiation intensity at points equidistant around the source, normalized to the radiation intensity at a reference distance on the radius bisecting the source? 1. convergence function 2. kerma function 3. anisotropy function 4. sievert function 3. anisotrop...

MDCB EXAM QUESTIONS AND ANSWERS. A+ GRADED GUIDE. Which of the following CT numbers (Hounsfield units) is most closely related to lung tissue? 1. -1000 2. -750 3. 0 4. +1000 2. -750 Which of the following CT numbers (Hounsfield units) is most closely related to air? 1. -1000 2. -750 3. 0 4. +1000 1. -1000 Parent and daughter radioactive isotopes are said to be in secular equilibrium when they? 1. are equal in atomic weight 2. have the same half-life 3. have a constant ratio...

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 ...