Part3 Dental Imagery (100-149) Prof. Pen Nun

100. ដំណាក់កាលទី៥នៃការលាងហ្វិលគឺ:
 Developing
 Fixing
 Washing
 Drying
101. X-rays and Gamma rays are a form of:
 Light
 Particle radiation
 Electromagnetic radiation
 All are corrects
102. Undercut is the loss of resolution at a sharp, thickness transition area due to:
 Scattering within the part
 Backscatter
 Sidescatter
 Scattering within the film
103. Image quality indicators (IQIs) provide information about the level of:
 Resolution and contrast sensitivity
 Resolution and film latitude
 Contrast sensitivity and latitude
 Contrast sensitivity only
104. The number of X-ray or Gamma photons that are transmitted through a material depends on the:
 Energy of the photons
 Thickness of the material
 Atomic number of the material
 All of the above
105. Bremsstrahlung production of X-rays produces radiation that is composed of:
 A small number of very defined energies
 A continuous spectrum of energies over some range
 Radiation of only one energy
 None of the above
106. Which two types of radiation-matter interactions account for the majority of attenuation in typical industrial radiography? :
 Compton Scattering and photoelectric absorption
 Compton Scattering and pair production
Pair production and photoelectric absorption
 None of the above
107. X-ray generators produce radiation through:
Bremsstrahlung processes
 K-shell emmission processes
 Radioactive decay
 Bremsstrahlung processes and K-shell emmission processes
108. Radiation beam filters are sometime used in X-ray radiography to:
 Remove some of the low energy radiation to increase definition
 To remove some of the low energy radiation to increase contrast sensitivity
 Remove some of the low energy radiation to reduce definition
 All are corrects
109. Lowering the energy of the radiation used to produce a radiograph will generally result in:
Less latitude
 Higher contrast sensitivity
 A Longer exposure time
 All of the above
110. Radiographic contrast describe:
 The sharpness of lines in a radiograph
 The differences in photographic density in a radiograph
 The average photographic density in a radiograph
 The difference in density between two different radiographs
111. A specific radioactive source will always produce gamma rays at the same:
 Intensity
 Activity
 Energy levels
 None of the above
112. X-rays and Gamma rays:
Always travel in a straight line
 Can be influenced by an electrical field
 Can be influenced by a magnetic field
 None of the above
113. X-rays and Gamma rays are often referred to as photons because:
 They possess a charge
 They have mass
 They occur as small packets of energy
 None of the above
114. Newtons Inverse Square Law is useful in radiography because it indicates how the radiation intensity is affected by:
 Radioactive decay
 Distance from the source
 The size of the source
 None of the above
115. The main advantage of real-time radiography over film is:
 Higher image contrast sensitivity
 Inspection can be performed more rapidly
 Higher image definition
 Lower equipment costs
116. Higher energy radiation will have more:
 Speed
 Incident Intensity
 Penetrating power
 Incident Intensity and Penetrating power
117. Image quality indicators are usually placed:
 Anywhere on the back side of the film
 On the front side of the film near the primary area of interest
 On the front side of the test component in an area of similar thickness to the primary area of interest
 On the back side of the test component in the area of interest
118. Exposure to ionizing radiation can be limited:
 With the use of shielding
By increasing distance form the source
 By limiting the time exposed to the radiaiton
 All of the above
119. The Film contrast is determined by:
 Type of film used
Process by which the film was developed
 Radiation energy used
 Type of film used and the process by which the film was developed
120. Collimators are used to:
 Reduce the radiation beam spread
 Filter the radiation beam
 Increase film latitude
 Decrease film latitude
121. Stationary lab or shop X-ray systems usually rely on what to limit exposure to the radiation?:
 Distance controls
 Time limits
 Shielding
 All of the above
122. The amount of geometric unsharpness in a radiograph is affected by:
 The source to film distance
 The source to object distance
 The size of the source
 All of the above
123. X-rays and Gamma rays:
Are both affected by radioactive decay
 Are both produced by a radioactive atom
 Have completely different properties
 Differ only in their source
124. Radiographic inspection should be used for crack detection only when:
The crack is large
 The test componet is a casting
 The test component is a weldment
 The orientation of the crack is known
125. Who is given credit for the discovery of radioactive materials?:
 Henri Becquerel
 Wilhelm Roentgen
 Marie Curie
 Pierre Curie
126. Unexposed X-ray film is comprised of a plastic, transparent base coated with an emulsion containing radiation-sensitive particle known as:
Metalic silver crystals
 Silver halide grains
 Metalic silver crystals AND Silver halide grains
 Neither Metalic silver crystals and Silver halide grains
127. Manmade sources of radioactive sources are produced by:
By splitting the nucleus of atoms in the source material
 Adding electrons to the source material
 Introducing an extra neutron to the atoms of the source material
 None of the above
128. In dental radiography, the quality of the x-ray beam is controlled by:
 Kilovoltage peak
 Milliamperage
 Exposure time
 Source-to-receptor distance
129. A higher kilovoltage produces x-rays with:
 Greater energy levels
 Shorter wavelengths
 More penetrating ability
 All of the above
130. Identify the unit of measurement used to describe the amount of electric current flowing through the x-ray tube:
 Volt
 Ampere
 Kilovoltage peak
 Force
131. Radiation produced with high kilovoltage results in:
 Short wavelengths
 Long wavelengths
 Less penetrating radiation
 Lower energy levels
132. In dental radiography, the quantity of radiation produced is controlled by:
 Kilovoltage peak
 Milliamperage
 Exposure time
 Milliamperage and exposure time
133. Increasing milliamperage results in an increase in:
 Temperature of the filament
 Mean energy of the beam
Number of x-rays produced
 Temperature of the filament and number of x-rays produced
134. Identify the milliamperage range for dental radiography:
1 to 5 mA
 4 to 10 mA
 7 to 15 mA
Greater than 15 mA
135. The overall blackness or darkness of an image is termed:
 Contrast
 Density
 Overexposure
 Polychromatic
136. If kilovoltage is decreased with no other variations in exposure factors, the resultant image will:
 Appear lighter
 Appear darker
 Remain the same
 All are corrects
137. Identify the term that describes how dark and light areas are differentiated on an image:
 Contrast
 Density
 Intensity
 Polychromatic
138. A radiograph that has many light and dark areas with few shades of gray is said to have:
 High density
 Low density
 High contrast
 Low contrast
139. The total energy contained in the x-ray beam in a specific area at a given time is termed:
 Kilovoltage peak
 Beam quality
 Intensity
140. A beam of energy that has the power to penetrate substances and record image shadows on photographic film.:
 X-ray
 X-radiation
 Radiography
 Radiograph
141. Coolidge:
 Discovered x-rays
 Developed first x-ray tube
 Introduced bisecting technique
 Exposed first dental radiograph
142. Fitzgerald:
 Developed first x-ray tube
 Wrote first paper on the danger of x-radiation
 Exposed first dental radiograph in United States (skull)
 Introduced long-cone paralleling technique
143. Kells:
 Exposed first dental radiograph in United States (skull)
 Introduced long-cone paralleling technique
 Wrote first dental text; introduced bite-wing technique
 Exposed first dental radiograph in United States (living patient)
144. The components of xray machine is:
 Tubehead
 Extension arm
 Control panel
 All are corrects
145. The components of xray film is:
 Film base
 Adhesive layer
 Film emulsion, and protective layer
 All are corrects
146. The types of film used in dental radiography is:
 Intraoral film
 Extraoral film
 Duplicating film
 All are corrects
147. The steps in film processing is:
 Development
 Fixation and rinsing
 Washing, and drying
 All are corrects
148. Chemical solution used in development process to reduce the exposed, energized silver halide crystals:
 Developer
 Washing
 Drying
 All are corrects
149. The developer solution basic ingredients is:
 Developing agent
 Preservative
 Accelerator, and
 Restrainer
 All are corrects
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