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Term 3 IP2-Unit 4B
Technique Charts
| Question | Answer |
|---|---|
| What are the 3 needs for Standardization of TECHNIQUE: (Quality, Patient, Costs) | 1)Consistent Quality 2)Reduced Pt Exposure 3)Reduced Operating Costs |
| What are the 3 needs for Standardized EXPOSURE CHARTS: (New, Student, Trouble) | 1)New Techs 2)Students 3)Help Trouble Shooting |
| Standardization involves 3 Phases: (Ex,Pr,Pr) | 1)Standardize Exposure Factors 2)Standardize Projections 3)Standardize Processing Procedures |
| List the 7 criteria of a Satisfactory Radiograph: (DDDP CSSS)- | 1Translucent Densities 2)Silver deposits on the image 3)Part fully penetrated 4)mAs factor for best overall density 5)Differentiating contrast between all densities 6)Details not obscured by scatter 7)Max sharpness/true shape |
| Explain how to adapt a chart from one institution to another: | Need 3 phantoms (Skull, Chest, Extremity); Use optimum kV & old technique in new hospital; Go Up or Down w/ mAs Apply same mAs % difference to all similar exams; Repeat process for each part (skull, Extremity, Chest) |
| Define Optimum kVp: | The minimum kVp needed to penetrate the part |
| What are the 2 most common types of charts? | Fixed kVp Chart Variable kVp Chart |
| Fixed kVp is also called _________ kVp. | Optimum |
| What are the steps to creating a Fixed kVp chart? | 1st Step: Separate anatomical parts into Small, Medium, Large 2nd Step: Get phantom & make 3 exposures to determine optimum density 3rd Step: Small patient reduce mAs 30%/ large increase mAs 30% 4th step: Repeat for chest & extremities |
| How do you use a Variable kVp Chart? | 2 kVp change for every cm change from average; Measure part+double it+add 40= new kVp for that part & select mAs from a guide |
| What are 4 advantages of Fixed kVp charts? | 1)kVp tends to be higher 2)pt receives lower exposure 3)greater latitude for error 4)contrast more consistent |
| Disadvantage of Fixed kVp charts? | May require increasing mAs (exposure to patient) and more chance of motion |
| After selecting/developing a perfect technique chart select a patient. Patient must be over _________ ________, already having the _________, and not being ____________ upon. | Reproductive Age; Exam; Experimented |
| Give the following mAs conversions: 1)Infancy (birth - 2): 2)Preschool (2-6): 3)School Age (6-12): 4)Teenage (> 12yr): | 1) 0-2yr: X mAs by 0.25 2) 2-6yr: x mAs by 0.50 3) 6-12yr: x mAs by 0.75 4) > 12yr: No Change |
| There must be a ______% changes in mAs to have a visible change in Density. | 30% |
| Cast Conversions: 1)Sm Extremity: Dry & Wet 2)Lg Extremity: Dry & Wet 3)1/2 Cast: 4)Fiberglass / Air splint: | 1)Dry: 2x's mAs or add 15% kVp; Wet: 3x's mAs or 22% kVp 2)Dry: 3x's mAs or add 22% kVp; Wet: 4x's mAs or 30% kVp 3)Half: Add 50% mAs or 8% kVp 4)No Change |
| Technique Change for Soft Tissue: | Reduce kVp 15% |
| Ionization Chambers in an AED are located ________ the cassette. | in front of |
| Back Up timers protect the _________ and protect the _______. | Patient; Tube |
| Is eliminating the need for proper positioning an advantage of AEC? | No |
| In AEC, each incremental density setting corresponds to a _____ % change in density. | 25% |
| Backscatter has the greatest impact on what type of AEC unit? | Phototimer type (not ionization chamber type) |
| What are the 2 most important factors affecting film density when using AEC? | Positioning & Detector Selection |
| Minimum Response Time, Poor Positioning, Wrong Detector Selection, & SID: Which one does NOT cause overexposure while using AEC? | SID |
| True or false, it is acceptable to use the center detector when performing abdominal radiography. Why? | False; Patient positioning could cause the spine to be over the detector causing overexposure of soft tissue |
| OID affects density when using AEC? True of false | False |
| Can increasing mA or kVp shorten the minimum response time? | No, nothing a tech can do can shorten the Min Response Time |
| Beam intensity can affect exposure time with AEC? True or False | True |
| What is the most often caused reason for activation of the backup timer? | Radiographer Error |
| Backup Timers should never allow the patient to be exposed to no more than ______ mAs or by government standards _______ mAs. | 600 mAs, 800 mAs |
| What will happen to the exposure time if the x-ray tube is not aligned to the Bucky Grid? | Excessively long |
| What change in mA can intentionally increase the exposure time when using AEC? | Decreasing mA |
| Changing from fast-speed screen cassette to medium-speed screen cassette will have what effect on exposure time? | Unaffected |
| Insufficient collimation will have what affect on exposure time with AEC? | Reduce exposure time |
Created by:
foster1317
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