Mosby Mock Exam Questions with well explained answers

The appropriate personnel protective equipment for the care of a patient with suspected TB would be: - Answer-respiratory mask The TD5/5 for the whole brain is: - Answer-45 Gy in 25 fx The histopathological type found most commonly in the neck is: - Answer-squamous cell carcinoma The transporter of oxygen in the blood is the: - Answer-hemoglobin The linear attenuation coefficient (µ) is expressed in: - Answer-1/cm Arrange the following X-ray energies in order of increasing PDD penetration: 1) orthovoltage 2) 18 MV 3) 10 MV 4) superficial - Answer-superficial, orthovoltage, 10MV, 18MV Radiation therapy using a solid or sealed radioisotopes for the body surface or tissue implantation is: - Answer-brachytherapy Which site is common for the development of Ewing's sarcoma? - Answer-pelvis To prevent the distant spread of prostatic tumors, the ___ should be included in the treatment fields. - Answer-common iliac nodes An important risk factor for the development of cervical cancer is: - Answer-human papilloma virus (HPV) You have an emergency spinal cord compression at the level of lumbar spine 2. The physician orders preliminary field to cover L1-L3. What's the approx field size? - Answer-8 x 10**lumbar spine is about 3-3.5cm in length 3 bodies (3.5cm) = 10.5 What is the TD5/5 for the optic chiasm? - Answer-60 Gy What is the primary spread of a glioma? - Answer-local invasion What thickness of cerrobend would be equivalent to 5cm of lead? - Answer-6.0cm **1cm lead = 1.2cm cerrobend **cerro is about 15% less dense than lead What technique is used to treat early pre-cancers of the cervix? - Answer-loop electrosurgical excision procedure (LEEP) Beyond the point of beam intersection, what would be an advantage of using the wedged pair technique? - Answer-rapid dose falloff **highest dose concentration near hinge of wedge, then rapid falloff What can early stage ovarian cancer be successfully treated with? - Answer-surgery followed by chemo What is the worst prognosis for a primary skin cancer? - Answer-melanoma What is the term for the procedure used in which an implant is made using a trocar, with radioactive sources introduced into the trocar and then the trocar is removed? - Answer-interstitial afterloading Chondrosarcoma originates in what type of tissue? - Answer-osseous tissueAll of the following are signs of ovarian cancer except: 1) vaginal bleeding, 2) abdominal bloating, 3) nausea, 4) constipation - Answer-1) vaginal bleeding What tool is required in order to evaluate blood pressure? - Answer-sphygomomanometer A patient is treated at 82cm SSD instead of 80cm SSD. The planned dose was 300 cGy, what was the approx dose delivered? - Answer-285 cGy I1/I2 = (D2/D1)^2 What chemo is known to cause hearing loss? - Answer-cisplatin **AND renal dysfunction What is the lumen size for a urinary catheter measured in? - Answer-French **the lower the French size, the smaller the lumen A patient was to receive 250cGy/fx for 10fx at a distance of 100cm SSD. The patient was actually treated at 105cm SSD. What was the total dose delivered? - Answer-2267 cGy I1/I2 = (D2/D1)^2 When shielding a linac vault where photon beam energies greater than 10MV are present, what must be taken into account? - Answer-shielding for neutron contamination **higher energy beams have neutron contamination What's the optimal hinge angle for a 45 degree wedged pair? - Answer-90 degreeshinge = 180 - 2(wedge angle) What information must the cutter know in order to make custom blocks? - Answer-1) energy of the machine 2) target-to-film distance 3) target-to-tray distance