Basic Clinical Sciences - II Mid - II, November - 2014

1.Radiation therapy works by damaging the _________ of cancerous cells.
  • DNA
  • RNA
  • Cell Membrane
  • Proteins
Answer: A
2.Which of the following cells are generally considered to be radioresistant?
  • Leukemia
  • Lymphoma
  • Germ Cell Tumor
  • Melanoma, Renal Cell Cancer
Answer: D
3.LD50 stands for
  • Lesser dose, 50%
  • Lethal Dose, 50%
  • Lethal Dose, 50%
  • Laboratory Dose, 50%
Answer: B
4.Acute effects of the radiation on the skin does not involve
  • Erythema
  • Dry/moist desquamation
  • Inflammation
  • Perspiration
Answer: D
5.Which of the following is a common photocathode material?
  • Ag-O-Cs
  • GaAs:Cs
  • Bialkali (Sb-K-Cs, Sb-Rb-Cs)
  • All of the these
Answer: D
6.Scintillation camera accumulates events, or counts, of _________ that are absorbed by the crystal in the camera.
  • Gamma photons
  • alpha particles
  • beta particles
  • visible photons
Answer: A
7.PET (nuclear medicine) stands for
  • Photon Emission Tomography
  • Proton Emission Tomography
  • Positron Emission Tomography
  • Positron Ejection Tomography
Answer: C
8.What is the Clinical Use of Sm-153 (an isotope of samarium)?
  • Therapy for Polycythemia
  • to Treat pain during Bone cancer
  • Bone Imaging
  • Renal Imaging
Answer: B
9.What Radiopharmaceutical is used for the treatment of Polycythemia Vera:
  • Sr-89 Metastron
  • I-131 Hippuran
  • P-32 Sodium Phosphate
  • P-32 Sodium Chromate
Answer: C
10._____________ is a scintillation crystal widely used in nuclear medicine.
  • NaI(Tl)
  • CsI(Tl)
  • CaF2(Eu)
  • LaCl3(Ce)
Answer: A
11.The amount of radiation used in photon radiation therapy is measured in the units of ___________.
Answer: Gray (Gy)
12.Cell survival data are generally plotted as logarithm of the ____________ versus radiation dose.
Answer: Surviving fraction
13.Dose limitation requirements are generally based on the recommendations of the ICRP, where ICRP stands for ______________________
Answer: International Commission on Radiological Protection
14.A ______________ is a clouding of the lens inside the eye which leads to a decrease in vision.
Answer: Cataract
15.______________ is a technique used to image gamma radiation emitting radioisotopes.
Answer: Scintigraphy
16.The nuclear medicine hepatobiliary scan is clinically useful in the detection of the ____________ disease.
Answer: Gallbladder or liver or bile duct
17.The time taken for the number of radioactive nuclei in the sample to reduce by a factor of two is known as __________________.
Answer: Half-Life
18.A __________________ (which typically consist of a lead plate) is used to improve the spatial resolution of a gamma-camera.
Answer: Collimator
19.A ___________________ consists of a lower level discriminator (which passes voltage pulses which are than its setting) and an upper level discriminator (which passes voltage pulses lower than its setting).
Answer: Pulse height analyser (PHA)
20.The SI Unit of radioactivity is the __________ while the traditional unit of radioactivity is the _____________.
Answer: Becquerel (Bq), curie (Ci)