test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| show | Long TR short TE
🗑
|
||||
| if the matrix is adjusted from 256x256 to 128x256, what effect will this have on the image? | show 🗑
|
||||
| show | to null CSF- you can see pathology
🗑
|
||||
| show | at all field strength
🗑
|
||||
| show | all tissues with the same T1 value
🗑
|
||||
| show | predictable flow
🗑
|
||||
| show | stationary tissue has a higher signal later in a slice, flow has bright signal in the beginning of the slice
🗑
|
||||
| when using regulaar spin echo | show 🗑
|
||||
| to better visualize flow, you should use | show 🗑
|
||||
| show | fat and water are close to anatomy
🗑
|
||||
| when spins are together and give a lot of signal they are.. | show 🗑
|
||||
| when you use 3 or more RF pules to produce an echo this will be a what? | show 🗑
|
||||
| show | TR must be significantly shorter than T2
🗑
|
||||
| show | a long t2 restores transverse magnetation, the tails of FID and spin echos will merge, a signal of amplitude is produced
🗑
|
||||
| the first gradient applied in gradient echo sequence is applied | show 🗑
|
||||
| GRE sequences are best done to.. | show 🗑
|
||||
| things that affect SNR are | show 🗑
|
||||
| when you decrease the size of the voxel | show 🗑
|
||||
| A course matrix | show 🗑
|
||||
| if you half the number of phase encodings | show 🗑
|
||||
| Boxel wolume is determined by | show 🗑
|
||||
| proton density weighting | show 🗑
|
||||
| the applitude of signal in the area bing examined is determined by | show 🗑
|
||||
| show | spin echo
🗑
|
||||
| show | angle
🗑
|
||||
| as the received bandwidth increases | show 🗑
|
||||
| show | ?
🗑
|
||||
| SNR is increased by | show 🗑
|
||||
| contrast to noise ratio if affected by | show 🗑
|
||||
| only signal from what can be visualized | show 🗑
|
||||
| show | reduces partial boluming increases spatial resolution
🗑
|
||||
| the matrix determines | show 🗑
|
||||
| show | smaller FOV, thin slices, fine matrix
🗑
|
||||
| to optimize spatial resolution | show 🗑
|
||||
| show | fewer slices
🗑
|
||||
| TR is affected by | show 🗑
|
||||
| show | increase area of signal
🗑
|
||||
| show | increases anatomy coverage
🗑
|
||||
| increasisng the slice thickness will | show 🗑
|
||||
| show | increased SNR, isotropic volumes, no gap
🗑
|
||||
| show | proton density because of the short te and also a spin echo
🗑
|
||||
| show | fill more than one line of k space at a time, have faster scans, have various weighting
🗑
|
||||
| show | more echos with shallow phase encoding near the effected TE
🗑
|
||||
| some benefits of t2 fast spin echo are | show 🗑
|
||||
| long turbo factors | show 🗑
|
||||
| short turbo factor | show 🗑
|
||||
| the weighting of an inversion recovery sequence | show 🗑
|
||||
| in inversion recovery the TR is | show 🗑
|
||||
| inversion recovery is used to produce | show 🗑
|
||||
| a TI of 300 ms is used to | show 🗑
|
||||
| when using contrast with inversion recovery | show 🗑
|
||||
| Flair is used to | show 🗑
|
||||
| show | true
🗑
|
||||
| to prevent saturation the flip angle should be large and TR long true or false | show 🗑
|
||||
| show | false- we use 180 to control t2*
🗑
|
||||
| in GRE, the GR controls the number of slices that can be excited during the aquisition true or false | show 🗑
|
||||
| show | false
🗑
|
||||
| the flip angle in tr maintains steady state true or false | show 🗑
|
||||
| show | true
🗑
|
||||
| show | false it's a spoiler
🗑
|
||||
| show | false
🗑
|
||||
| coherent pulse sequences produce dard fluid true or false | show 🗑
|
||||
| show | true
🗑
|
||||
| disadvantages of coherent sequences are poor SNR, 2D and loud noise true or false | show 🗑
|
||||
| incoherent pulse sequences use gradient rephaseing to produce and echo true or false | show 🗑
|
||||
| show | true
🗑
|
||||
| show | false
🗑
|
||||
| show | true gre is good for flow
🗑
|
||||
| show | false
🗑
|
||||
| show | true
🗑
|
||||
| if nuclei are out of phase at 40 ms they will be in phase 40 ms later true or false | show 🗑
|
||||
| show | true
🗑
|
||||
| presat is transmitted in the same frequency and evenly to the whole fov so that dense areas of fat receive the same energy as areas with less dense fat true or false | show 🗑
|
||||
| show | false
🗑
|
||||
| show | true
🗑
|
||||
| show | false
🗑
|
||||
| show | false
🗑
|
||||
| pre saturation pulses are only usefull is they are applied to tissue true or false | show 🗑
|
||||
| show | true
🗑
|
||||
| show | true
🗑
|
||||
| presaturation is generall used in either t2 or proton density weighting true or false | show 🗑
|
||||
| pulse of flow is not constant so that gradient moment rephasing if often more effective on venous rather than arterial flow true or false | show 🗑
|
||||
| show | true
🗑
|
||||
| show | false
🗑
|
||||
| entry slice phenomenon increases when using short TR true or false | show 🗑
|
||||
| flow related enhancement increases as the TE Decreases true or false | show 🗑
|
||||
| show | true
🗑
|
||||
| show | true
🗑
|
||||
| stangnet flow behaves as startionary tissue true or false | show 🗑
|
||||
| TE has not effect on time of flight effect true or false | show 🗑
|
||||
| as the velocity flow increases the time of flight decreases true or false | show 🗑
|
||||
| laminar flow is considered second order flow true or false | show 🗑
|
||||
| show | true
🗑
|
||||
| show | true
🗑
|
||||
| show | True
🗑
|
||||
| there are no adverse effects from EPI because you dont' use numerous RF pulses true or false | show 🗑
|
||||
| in an epi sequence the TR are short true or false | 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:
1145508893
Popular Radiology sets