KCL Dentistry Maxexam: Radiology RESIT Exam Final Answers PDF

## KCL Dentistry Maxexam: Radiology RESIT exam ### Radiation Protection Principles **Q1.** A dentist assesses the clinical information provided by another dentist to decide if a radiograph should be taken. (mark: 1) Select one: - **Justification** **Q2.** A dentist/dental therapist uses a recta...

## KCL Dentistry Maxexam: Radiology RESIT exam ### Radiation Protection Principles **Q1.** A dentist assesses the clinical information provided by another dentist to decide if a radiograph should be taken. (mark: 1) Select one: - **Justification** **Q2.** A dentist/dental therapist uses a rectangular collimator to take a bitewing radiograph (mark: 1) Select one: - **Optimisation** **Q3.** A dentist/dental therapist decides to take a periapical instead of a panoramic radiograph in the presence of localised periodontal pocketing. (mark: 1) Select one: - **Minimisation** ### Intraoral Radiography **Q4.** Which technique is the most reliable for showing the root apex of a tooth? (mark: 1) Select one: - **Paralleling technique** **Q5.** Which technique shows up to ten erupted teeth in one image? (mark: 1) Select one: - **Bitewing technique** **Q6.** Which technique helps to show the bucco-palatal position of an unerupted canine? (mark: 1) Select one: - **Panoramic technique** <start_of_image> Patient is seated in the dental chair, where should this warning sign be placed? (mark: 1) Select one: - **At the entrance to the dental surgery** **Q7.** Looking at the radiograph above, please identify item B indicated by the arrow. (mark: 1) Select one: - **Metallic restoration** **Q8.** Looking at the radiograph below, please identify item D indicated by the arrow. (mark: 1) Select one: - **Floor of the mouth** **Q9.** Looking at the radiograph below, please identify item G. (mark: 1) Select one: - **Alveolar bone** **Q10.** Which official body published the statutory instrument "Ionising Radiation (Medical Exposure) Regulations 2017"? (mark: 1) Select one: - **Department of Health and Social Care** ### Roles and Responsibilities **Q11.** Who is ultimately responsible for ensuring that all staff receive appropriate training? (mark: 1) Select one: - **The employer** **Q12.** Who will authorize a radiation exposure? (mark: 1) Select one: - **The practitioner** **Q13.** Who presses the exposure button when taking an X-ray on a patient? (mark: 1) Select one: - **The operator** **Q14.** Who is responsible for ensuring compliance with the Local Rules? (mark: 1) Select one: - **The radiation protection supervisor** **Q15.** Who is allowed to be within the controlled area during an X-ray exposure? (mark: 1) Select one: - **The patient** **Q16.** In a general dental practice setting where the dentist takes intraoral radiographs whilst the patient is seated in the dental chair, where should this warning sign be placed? (mark: 1) Select one: - **At the entrance to the dental surgery** ### Terminology Describing Radiation Dose **Q17.** Which measurement term is used to take into account the part of the body being irradiated? (mark: 1) Select one: - **Effective dose** **Q18.** Which measurement term is used to take into account the type of radiation used? (mark: 1) Select one: - **Effective dose** **Q19.** Which term is measured in Grays or milligrays? (mark: 1) Select one: - **Radiation absorbed dose** **Q20.** Which one allows direct comparison of radiation doses from different investigations of different parts of the body? (mark: 1) Select one: - **Collective dose** **Q21.** Which measurement term is used when considering a whole population? (mark: 1) Select one: - **Collective dose** **Q22.** In dentistry, when a particular radiographic examination is said to have a radiation dose of, for example, 2 mSv, what is the full name of the "dose" term? (mark: 1) Select one: - **Effective dose** ### Components of a Dental X-ray Machine **Q23.** Which component can get very hot? (mark: 1) Select one: - **Target** **Q24.** What can help to reduce the quantity of low energy photons hitting the patient? (mark: 1) Select one: - **Aluminium filter** **Q25.** What is the tube made of? (mark: 1) Select one: - **Glass** **Q26.** What is the name of the electrically negative end? (mark: 1) Select one: - **Cathode** **Q27.** What is the immediate outer casing made of? (mark: 1) Select one: - **Lead** **Q28.** When an intraoral radiograph is being taken, who is allowed to press the exposure button? (mark: 1) Select one: - **The dentist/dental therapist** ### Atomic Structure **Q29.** What particle within an atom does the atomic number refer to? (mark: 1) Select one: - **Proton** **Q30.** What particle is important for X-ray production? (mark: 1) Select one: - **Electron** **Q31.** What length is the longer side of the aperture of a rectangular collimator? (mark: 1) Select one: - **50 millimeters** **Q32.** Looking at traditional X-ray films, when used inside an extraoral cassette, you will also need what in order to help reduce the radiation dose? (mark: 1) Select one: - **Intensifying screen** ### Personal Lead Protection **Q33.** When taking an upper standard occlusal radiograph, how is the patient's thyroid gland protected from radiation? (mark: 1) Select one: - **Thyroid collar** **Q34.** Which lead protection is required for a pregnant patient having bitewings taken? (mark: 1) Select one: - **No personal lead protection is required** **Q35.** What is B? (mark: 1) Select one: - **Transformer** **Q36.** What is C? (mark: 1) Select one: - **Aluminium filter** **Q37.** What is D? (mark: 1) Select one: - **Spacer cone** **Q38.** What is E? (mark: 1) Select one: - **Lead shield** **Q39.** What is F? (mark: 1) Select one: - **Oil** **Q40.** What is G? (mark: 1) Select one: - **Collimator** **Q41.** What is H? (mark: 1) Select one: - **X-ray beam** **Q42.** Which component removes the lowest energy photons from the X-ray beam? (mark: 1) Select one: - **Aluminium filter** **Q43.** Which component changes the shape of the X-ray beam? (mark: 1) Select one: - **Collimator** ### Radiation Dose and Relative Harm to Patients **Q44.** During periapical radiography, if a circular collimator is used instead of a rectangular collimator, what magnitude is the relative harm to the patient? (mark: 1) Select one: - **4 times less harmful** **Q45.** During periapical radiography, if the Xray tube is placed twice as far away from the patient as normal, what magnitude is the relative harm to the patient? (mark: 1) Select one: - **4 times less harmful** **Q46.** When an intraoral radiograph is being taken, who is allowed to stay in the controlled area? (mark: 1) Select one: - **The patient** **Q47.** Which one of the following traditional X-ray film is associated with the lowest radiation dose? (mark: 1) Select one: - **F-speed film** **Q48.** Which one of the following is the highest radiation dose imaging investigation (using standard equipment)? (mark: 1) Select one: - **Cone Beam CT scan of the full Mandible and Maxilla** ### Harmful Effects of Ionizing Radiation **Q49.** Genetic effects may be described as which one of these effects? (mark: 1) Select one: - **Stochastic effect** **Q50.** Which effect occurs only above a threshold dose of radiation? (mark: 1) Select one: - **Deterministic effect** **Q51.** Which effect is caused by those X-ray photons that are totally absorbed by the patient during dental radiography? (mark: 1) Select one: - **Photoelectric effect** **Q52.** Vomiting within 1 hour of exposure to radiation would be described as what type of effect? (mark: 1) Select one: - **Deterministic Effect** **Q53.** Which one of the following traditional X-ray film is associated with the highest resolution image? (mark: 1) Select one: - **F-speed film** **Q54.** In relation to radiation protection measures during intraoral radiography, what is the minimum size (radius) of the controlled area, measuring from the patient's head and not in the line of the primary beam? (mark: 1) Select one: - **1.5 metres** **Q55.** Looking at the radiograph below, which item corresponds to mesial caries in dentine? (mark: 1) Select one: - **Item C** **Q56.** Which official body made recommendations about dose limitation based on the principles of justification, optimisation and limitation? (mark: 1) Select one: - **International Commission for Radiation Protection** **Q57.** What is the estimated risk of a fatal cancer induction in dental radiography using modern digital equipment from one full dental panoramic tomograph? (mark: 1) Select one: - **1 in one million** ### Image Receptors **Q58.** Which one produces an indirect digital image? (mark: 1) Select one: - **Phosphor plate** **Q59.** Which one produces the highest spatial resolution? (mark: 1) Select one: - **Solid state sensor** **Q60.** Which one is associated with higher radiation dose? (mark: 1) Select one: - **Radiographic film**