POST on your blog: assessment activity plan

• Provide the course/potential course name and learner characteristics (think back to our first discussion about who are our learners).

Continuing Education Dental Radiography

Learner Characteristics- Learners will have come from various backgrounds and will have different learning styles.

-The course will be theory based and then a hand on clinical practice will be offered to complete the training.

- Dental radiography is a two part course. A didactic portion presents the history of radiation and the theory of radiation physics. Techniques and protocols are learned in the textbook environment and examined prior to actual x-ray exposure. After successful completion of the didactic portion the learner is eligible to take the clinical where manikin and patient exposures are completed

-Our learners are diverse and come from different learner backgrounds as well as cultural backgrounds. The technology understanding they may have is also varied. So it will be important to create an ice breaker game in order to integrate the students to feel comfortable learning online.  

• State the objective - this is what you will assess- see Objective 2. in bold

1. State the history of dental radiography

2. Describe the components and function of the x-ray machine

3. Describe in general terms, types and techniques of intra-oral radiography

4. Explain the equipment used to produce radiographic images for conventional and digital radiography

5. Explain principles of the paralleling technique for periapical radiographs including armamentarium

6. Explain film chemistry during radiography exposure and processing

• Describe the assessment strategy - these are the instructions that you would give to your students for them to be able to complete the assessment.

Assessment 1- Record and create a video of yourself explaining Objective 3- See the 13 steps of the function and components of an x-ray tube head. Upload video and send the video link to me. You can use Youtube, Vimeo or send me the video in an email at esquires@vcc.ca.

Refer to you Radiography textbook Chapter 2   p.15 & 16 figure 2-12 and 2-17 diagram of dental x-ray tubehead  and x-ray tube

Operation- 13 steps of the function and components of an x-ray tube head:

                                         1.         X-ray machine is turned on

                                         2.         Current is directed to the filament circuit  and the stepdown transformer in the tubehead.  The transformer reduces the 110 or 220 entering line voltage to  3-5 volts.

                                         3.         The tungsten filament heats up in the cathode portion of the x-ray tube.  The outer shelled electrons are released from the tungsten filament when the current passes through it and heats it up.  Thermionic emission occurs when the outer shelled electrons of the tungsten atom acquire enough energy to move away from the filament surface and an electron cloud forms around the filament.

                                         4.         The exposure button is pushed.

                                         5.         The step up transformer (high voltage circuit) is activated and the electrons produced at the cathode are accelerated across the x-ray tube to the anode.

                                         6.         The molybdenum cup in the cathode directs the electrons to the tungsten target in the anode.

                                         7.         Electrons produced in the cathode (-)are accelerated across to the  anode (+).

                                         8.         Electrons strike the tungsten target or focal spot and are converted to 1% x-ray energy and 99% heat.

                                         9.         The heat produced during the production of x-rays is carried away from the copper stem and is absorbed in the insulating oil in the tubehead.

                                      10.         The leaded glass housing restricts the x-rays from escaping the x-ray tube.

                                      11.         A small number of x-rays are able to exit from the x-ray tube through the unleaded glass window portion of the x-ray tube.

                                      12.         The x-rays travel through the unleaded glass window the tubehead seal, and the aluminum disks.  The aluminum disks remove or filter the longer wavelength x-rays from the beam.

                                      13.         The x-ray beam then travels down the lead lined postion indicating device (PID) and exits the tubehead at the opening of the PID.

Rubric for Video of the Steps of X-Ray tube head operation

Level of Achievement	General Approach	Comprehension
Exemplary (40-50 marks)	•Addresses the objective. •States all 13 relevant, justifiable answers. •Presents 13 steps in a logical order. •Uses clear pronunciation and is organized	•Demonstrates all 13 accurate steps and complete understanding of the objective.
Adequate (29-30 marks)	•Does not address the objective explicitly, although does so tangentially. •States 9 to 12 justifiable answers. •Presents 9 to 12 steps in a logical order. •Uses acceptable pronunciation and is organized (one error to 3 errors).	• Demonstrates only 9 to 12 accurate steps and adequate understanding of the objective. •Less thorough than above.
Needs Improvement (28-25 marks)	•Does not address the objective clearly. •States 7 to 8 relevant answers. •Fails to use acceptable pronunciation and is not organized. (four or six errors).	• Demonstrates only 7 to 8 accurate steps and slight understanding of the objective. •Less thorough than above.
Below Average (24-0 marks)	•Does not address the objective at all. •States 6 to zero relevant answers. •Is not clear or organized. •Fails to use acceptable pronunciation and is not organized. (four or six errors).	• Demonstrates less than 6 accurate steps and incomplete understanding of the objective. •Less thorough than above.

• Explain why you chose this type of assessment for this course, objective and learners. This is your rationale for the assessment strategy.

-I chose the video assessment as this will help the students understand objective 2. Describe the components and function of the x-ray machine. It is a step by step instruction they will need to know so they may understand the science of taking radiographs in objectives 3 and 4.

-The video will allow a verbal learning so the student’s may have this foundational information for further integrated knowledge. I choose the video so students can be assessed quickly by taking a 5 minute video. The students can then be responsible for knowing the material as this will be enhanced when they are onsite for their clinical radiography training.

References

1. Bird D, Robinson D. Modern dental assisting. 11th ed. St. Louis, MO: Mosby Elsevier. 2015.
2. Center for Disease Control and Prevention. Guidelines for infection control in dental health-care settings. MMWR 52(RR17). 2003.
3. Iannucci JM, Howerton LJ. Dental radiography: Principles and techniques. 4th ed. St. Louis, MO: Mosby Elsevier. 2012.