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Quality Control
RDTC 213 Physics
| Question | Answer |
|---|---|
| __ is the measure of how much light is transmitted through film, how dark a film gets? | Optical Density (OD) |
| Optical Density - 0.5 is Light or Dark? | Light |
| Optical Density - 3.5 is Light or Dark? | Dark |
| __ is the basic tool showing how dark film is for various amounts of exposure? | Characteristic Curve |
| __ is the study of a film's response to exposure & development? | Sensitometry |
| QC includes Acceptance Testing, Maintenance, Periodic Performance Evals, Error Correction, & Documentation (T/F)? | True |
| QC is required by ACR, MQSA, and JRCERT (T/F)? | False - Joint Commision, MQSA, ACR |
| 3 Goals of QC - 1. Accurate & Timely __ ? | 1. Accurate & Timely DIAGNOSIS |
| 3 Goals of QC - 2. Minimize __ ? | 2. Minimize RADIATION EXPOSURE |
| 3 Goals of QC - 3. Minimize __ ? | 3. Minimize COST to Patient & Community |
| Checking indicators, locks, cables, light intensity, hand switch placement are examples of what type of QC? | Visual Inspection |
| Verifying that generator allowed techniques are allowed by the tube rating chart is what type of QC? | Overload Protection |
| kVp Accuracy allows what % of variance in a set? | ±5% |
| Mammography kVp Accuracy must be within what range? | ±1 kVp |
| In general, Timer Accuracy must be within what range? Except under __ ? | ±5% , Except under 10 ms |
| Antiquated tool for testing Timer? Only works with what type of generators? | Spinning Top, Single Phase |
| 1/10 sec set on a HWR Single Phase machine should see how many dots? | 6 dots (HWR = 60 pulses/sec, 1/10 x 60) |
| 1/10 sec set on a FWR Single Phase machine should see how many dots? | 12 dots (FWR = 120 pulses/sec, 1/10 x 120) |
| __ Timer Test, motor runs __ revolution/sec | Synchronous Motor, 1 rev/sec |
| Formula for degrees of arc on Synchronous Motor Timer? | Time Set x 360 (ex. 1/10 x 360 = 36° of arc) |
| Legal requirement for Half Value Layer? | HVL ≥ 2.5 mm Al equiv at 80 kVp |
| __ tests efficiency of tube Filtration? Fundamental way to protect patients. | Half Value Layer |
| HVL is mAs dependent (T/F)? | False - kVp dependent |
| No filtration = 60 mR, +3 mm = .03 R, did this HVL test pass or fail? | Pass - 3 ≥ 2.5 and .03 = 1/2 of 60 |
| __ is a QC test for generator output & consistency? | Exposure Linearity & Reproducibility |
| What creates the current in a Radiation Meter? | Ionization (Free electrons) |
| Acceptable range for Reproducibility output variance? | ±5% |
| Steps to calculate Reproducibility Range | 1. Avrg the output values, 2. Avrg + 5%, 3. Avrg - 5% |
| If all but 1 number are within calculated Reproducibility Range, the test PASSES (T/F)? | False - ALL must be in range |
| Acceptable range for LINEARITY output variance? | ±10% mA/mAs |
| Steps to calculate mA Linearity? | 1. Avrg the output values, 2. Avrg +10%, 3. Avrg - 10% |
| This QC test can also be used as a Timer test? | mAs Linearity |
| mR/mAs Linearity calculations should be Consistent as long as __ & __ do Not change? | kVp & distance |
| Grid Alignment test tool tests Alignment by off-centering to the grid, intentionally causing __ ? | Grid cut off |
| Grid Alignment test tool, the END dots should have the MOST exposure (T/F)? | False - Center most, Ends least |
| 2 tests of RESOLUTION | Resolution (bar) pattern & lp/mm Resolution tool |
| These 3 tests utilize geometry to measure Actual Focal Spot Size? | Star phantom, Pin hole camera, Slit camera |
| __is the organization that sets manufacturing standards applied to focal spot size? | National Electrical Manufacturer's Assoc (NEMA) |
| NEMA Tolerance for fs < 1.0 mm | +50% |
| NEMA Tolerance for fs 1.0>2.0 mm | +40% |
| NEMA Tolerance for fs >2.0 mm | +30% |
| An Additional .7 multiplier is applied to the WIDTH of the fs before NEMA Tolerance is applied (T/F)? | False - Length x.7 |
| Thickness tracking, kVp tracking, Minimum response time, & Backup timer are QC tests for __ ? | AEC |
| Formula for Repeat Rates | (# Repeats/# Total) x 100 |
| 3 ways to address concerns in Repeat Rate data | Inservicing, Individual Development, Equipment Investigation |
| Max Tabletop entrance dose for Fluoro? | 10 R/min |
| Max dose for Fluoro in Boost? | 20 R/min |
| Stabilized dose into "average" pt in Fluoro? | 3-5 R/min |
| __ is the amount of energy (xray/light) reaching a particular area of the film & producing a specific Optical Density? | Exposure |
| Optical Density Formula | OD = log₁₀ (Intensity IN/Int OUT) |
| log₁₀1 | 0 |
| log₁₀10 | 1.0 |
| log₁₀100 | 2.0 |
| log₁₀1000 | 3.0 |
| Two exposures, one __ the other, will be separated by __ on the Log Exposure scale? | Twice, 0.3 |
| On the Characteristic Curve, a curve to the LEFT will be __ with more __ for the same exposure? | Left = Faster, more Density |
| On the Characteristic Curve, a FLATTER slope will have (more/less) contrast? | Flat = LESS Contrast |
| In film, less contrast or "flatter" slope has (high/low) exposure latitude? | Less Contrast = HIGH Exp Latitude |
| __ is the range of techniques that produce an acceptable film density? | Exposure Latitude |
| (High/Low) Contrast curves allow for a Broader range of exposure? | Low Contrast |
| On the Characteristic Curve, a STEEPER slope will have (more/less) contrast? | Steep = MORE Contrast |
| Digital IR curves tend to be LINEAR or flat w low contrast, high latitude (True/False)? | True |
| log of any 2 #s that are HALF, difference will ALWAYS be .3 (True/False)? | True |
| ↑ Contrast = __ Exp Latitude | ↑ Contrast = ↓ Lat |
| ↓ Contrast = __ Exp Latitude | ↓ Contrast = ↑ Lat (wider) |
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