EXAM 1 DENSITY
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| What is density? | show 🗑
|
||||
| show | The quantity of radiation absorbed by the film.
🗑
|
||||
| What causes absorption of radiation on the film? | show 🗑
|
||||
| What affects the quality of a radiograph? | show 🗑
|
||||
| show | mAs (MilliAmperes x exposure time (seconds)
affects the quantity of xray photons produced.
kVp
🗑
|
||||
| When mAs is increased the quantity of xray photons will | show 🗑
|
||||
| show | Increase.
🗑
|
||||
| The mAs reciprocity law shows that any combination of mA and time (s) resulting in an equal mAs will | show 🗑
|
||||
| show | 30%
🗑
|
||||
| show | 40x 0.30= 12
40+12=52
🗑
|
||||
| Density rule of thumb, for repeat films with insufficient density, for an overexposure you would | show 🗑
|
||||
| Density rule of thumb, for repeat films with insufficient density, for an underexposure you would | show 🗑
|
||||
| Some things that influence density are | show 🗑
|
||||
| What is kVp? | show 🗑
|
||||
| show | As kVp is increased penetrability is increased and thus, density is increased. As kVp is decreased, density is decreased.
🗑
|
||||
| show | Increaseing or decreasing the kVp by 15% has the same effect as doubling the mAs, or halving it respectively.
🗑
|
||||
| show | Divergence of the beam affects intensity or the quantity of photons reaching the IR. The relationship is not exactly quantifiable.
🗑
|
||||
| As SID increases density will | show 🗑
|
||||
| As SID decreased density will | show 🗑
|
||||
| show | the more intense Cathode side of the beam which is capable of more penetration
🗑
|
||||
| show | Cathode side of the tube
🗑
|
||||
| show | Lower Abdomen
🗑
|
||||
| For an xray of the humerus what part of the anatomy should be under the cathode? | show 🗑
|
||||
| What area of anatomy should the cathode be over for an xray of the femur? | show 🗑
|
||||
| What area of the anatomy for an xray of the tibia/fibula should the cathode be positioned over? | show 🗑
|
||||
| What area of the anatomy for an xray of the Tspine should the cathode be positioned over? | show 🗑
|
||||
| What effect does collimation have on density? | show 🗑
|
||||
| show | increased scatter and an INCREASE in density evident on the film
🗑
|
||||
| A DECREASE in field size, due to increased collimation will cause | show 🗑
|
||||
| show | A patients skin
🗑
|
||||
| show | it absorbs lower-energy photons or "soft" radiation and "hardens" the beam
🗑
|
||||
| As filtration is INCREASED and the beam becomes more penetrating but beam quantity is reduced | show 🗑
|
||||
| show | density will INCREASE
🗑
|
||||
| show | of the variation of screen and film speed combinations
🗑
|
||||
| Does screen speed or film speed have a greater effect on density? | show 🗑
|
||||
| show | LESS exposure
🗑
|
||||
| How efficiently screens convert xray photons into light photons, or "Flourescence" is | show 🗑
|
||||
| Screen speed can be affected by | show 🗑
|
||||
| The most EFFICIENT type of phosphor is | show 🗑
|
||||
| show | the FASTER it will record the information
🗑
|
||||
| The THICKER the phosphor | show 🗑
|
||||
| The HIGHER the concentration of phosphors | show 🗑
|
||||
| show | Represents the overall speed of a film-screen system
🗑
|
||||
| A Routine high speed system would have a number of | show 🗑
|
||||
| An extremely slow system would have a number of | show 🗑
|
||||
| As RS is INCREASED | show 🗑
|
||||
| As RS is DECREASED | show 🗑
|
||||
| Grids are used to | show 🗑
|
||||
| show | MORE patient exposure (Increase in mAs) than non-grid exams
🗑
|
||||
| Increased grid RATIO or FREQUENCY results in | show 🗑
|
||||
| As grid RATIO/FREQUENCY is INCREASED, thus the amount of radiation reaching the IR is reduced 12:1 more scatter absorbed | show 🗑
|
||||
| As grid RATIO/FREQUENCY is DECREASED, thus more radiation reaches the IR 6:1 grid less scatter absorbed | show 🗑
|
||||
| Grid Ratio is determined by the | show 🗑
|
||||
| Grid Frequency is determined by the number | show 🗑
|
||||
| show | The Anatomical Part imaged
Pathology
Attenuation of Photons (absorbed, scattered, transmitted)
The Tissue thickness
The type of tissue irradiated
🗑
|
||||
| show | MORE photons
🗑
|
||||
| Thinner body parts absorb | show 🗑
|
||||
| show | Density is DECREASED
🗑
|
||||
| As tissue thickness is DECREASED i.e.>shoulder v.s. ankle | show 🗑
|
||||
| Tissue Density varies and then physical makeup depends on it's | show 🗑
|
||||
| Gas in the body has an atomic number or | show 🗑
|
||||
| Fat tissue in the body has an atomic number of | show 🗑
|
||||
| show | 7-8
🗑
|
||||
| show | 14
🗑
|
||||
| show | image density will DECREASE, highly dense body tissue absorbs more photons
🗑
|
||||
| show | image density will INCREASE, less dense body tissue absorbs less photons
🗑
|
||||
| Casts require an increase in exposure (mAs, and or kVp) | show 🗑
|
||||
| Destructive diseases may cause a | show 🗑
|
||||
| show | DECREASE in tissue density and require a REDUCTION in mAs and kVp
🗑
|
||||
| show | INCREASE in tissue density and require an INCREASE in mAs and kVp
🗑
|
||||
| Processor solutions must be kept at adequate temperatures, if the chemicals automatic replacement rate is under-replenished the images will result in | show 🗑
|
||||
| If the processing chemicals for the images auto replacement rate is Over-replenished, the resulting films will have | show 🗑
|
||||
| If the temperature of the developer is below the optimal temperature the images will have | show 🗑
|
||||
| If the temperature of the developer is above the optimal temperature, the images will have | show 🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
ABIGAILDRAKE1984
Popular Radiology sets