Welcome to your Radiography Name: Email: [Structure A is the fig] Renal pelvis Ureter Minor calyces Major calyces None Comment . [Digital receptors have what kind of response to exposure?] Nonlinear Linear Curvilinear Hyperlinear None . [What is the preferred source-to-skin distance for C-arms?] 12 inches 10 inches 20 inches 15 inches None . [Choose all of the following that are accurate (choose 6):] A magnetic field always surrounds an electrical charge in motion Current flows back and forth in AC Current flows in one direction in DC The volt is the unit of electrical current A conductor allows the flow of electrons The ampere is the unit of electromotive force The volt is the unit of potential difference The path of electrical current is called the circuit None . [Which of the following means there is a safe level of radiation for certain effects and those effects are not directly proportional to the dose received when the safe level is exceeded?] Nonlinear-nonthreshold effect Linear-nonthreshold effect Linear-threshold effect Nonlinear-threshold effect None . [The radiographer must be proficient in the use of which of the following medical instruments?] Angiography catheter Sphygmomanometer Thermometer Oxygen administration equipment None . [Which of the following bones has a coronal suture?] Frontal bone Temporal bone Occipital bone Parietal bone None . [Which of the following describes the amount of radiation required to increase the number of mutations in a population by a factor of 2?] Indirect effect Target theory Doubling dose Mutations None . [What type of x-ray machine uses a continually decreasing mA for the shortest times possible?] Ionization chamber Portable C-arm Falling load generator None . [An interaction that produces x-rays at the anode as a result of outer shell electrons filling holes in the K-shell is called:] Characteristic Photoelectric Compton Brems None . [For a direct PA projection of the skull, the central ray is directed:] 15 degrees caudad 25 degrees caudad Perpendicular to the image receptor Perpendicular to the image receptor, exiting the nasion when the OML is perpendicular to the IR None . [Which of the following photon–tissue interactions primarily involves K-shell electrons?] Photoelectric interaction Compton interaction Coherent scatter Pair production None . [Structure C is the fig.] Pisiform Lunate Triquetral Trapezium None Comment . [The greatest source of natural background radiation to humans is:] X-rays Delta rays Radon Radium None . [Positive beam limitation is also known as:] Use of collimators Beam limitation used for all exams Use of beam restrictors Automatic collimation None . [What occurs when the master molecule is struck by radiation?] Indirect effect Target theory Direct effect Doubling dose None . [If you suspect an object is contaminated, assume:] That it is contaminated That it should be used immediately That it is not contaminated, so as not to waste supplies That your hands must be sterilized None . [Structure J is the fig.] Talus Tuberosity of the calcaneus Cuboid Second or intermediate cuneiform None Comment . [The feature of the image intensifier that ensures the radiation dose striking the input phosphor is constant is the:] Photocathode Electron focusing lens Automatic brightness control Vidicon tube None . [For optimal radiation protection, what type of exposure technique should be used?] Low kVp, high mAs Small focal spot All manual technique High kVp, low mAs None . [The smallest exposure change able to be captured by a detector is called:] Spatial resolution Exposure latitude Pixel Contrast resolution None . [For AP projection of the foot, the central ray enters at the:] Head of the third metatarsal Head of the second metatarsal Base of the first metatarsal Base of the third metatarsal None . [The strength of the magnetic fields in a transformer is increased by:] Coiling the wires and placing them in adjoining machines Coiling the wires and letting their magnetic fields overlap Keeping the wires very straight, increasing their effectiveness Replacing the wires with diodes None . [Fibrous joints are called:] Synarthroses Amphiarthroses Diarthroses Mesocephalic None . [This structure has superior, middle, and inferior lobes:] Trachea Left lung Right lung Hilus None . [AECs may be tested using:] Phantoms Images of real patients Analog meters Fluoroscopic screens None . [If SID is decreased from 60 inches to 30 inches, what happens to magnification?] Increase Decrease No appreciable effect None . [As radiation strikes matter:] The energy of the rays is destroyed The energy of the rays is increased as they acquire the energy of the atoms The energy is transferred to the atoms according to the law of conservation of energy The energy is converted to matter according to Einstein’s theory None . [What is the most important reason for collimating and using gonadal shielding?] To prevent mutations from occurring in the human population To prevent ionization of water molecules in the body To control somatic effects of ionizing radiation exposure To increase contrast in the radiographic image None . [Photon-cell interactions occur:] Predictably By chance Seldom Only at high radiation doses None . Time's up
