Term
| At equilibrium, what signal is produced? |
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Definition
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| Which axis is always vertical? |
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Definition
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| If M = ____, the patient is NOT in the Bo |
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Definition
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| The Z axis is always in the same direction as ____ |
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Definition
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| An ECHO is produced following a ____ RF pulse |
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Definition
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Term
| tissues with high signal (white or bright) have a _____ transverse vector in X/Y plane |
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| tissue with a large transverse vector have ____ contrast |
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| tissues that show as shades gray have ____ contrast, or a smaller NMV than higher contrast tissuess |
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Definition
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Term
| areas of low signal (dark/black) have _____ contrast, and a _____ transverse vector |
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Definition
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Term
| another term for high signal/bright on image tissue is ______ |
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Definition
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| another term for low signal/dark on image tissue is ______ |
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Definition
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Term
| why do we focus on fat and water in image weighting? |
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Definition
| because they are the extreme opposites in different weightings - if one is bright, the other will be dark. |
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Term
| fat is chemically linked to _____ in the body |
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Definition
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Term
| which precesses slower at 1 T, fat or water? |
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Definition
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Term
| fat precesses slower than water - another way to say this is that fat has a lower ______ ______ |
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Definition
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Term
| which type of tissue has an electron cloud that protects it from effects of Bo? |
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Definition
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| Water is chemically linked to _____ in the body |
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Definition
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Term
| another term for proton density is ______ ______ |
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Definition
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| emphasizing one tissue characteristic over another is called |
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Definition
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| the term for values like TR, TE, slice thickness - things we select |
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Definition
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Term
| A group of parameters used for a particular scan is called a _______ |
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Definition
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| An ______ is a set of protocols for a particular body part. |
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Definition
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| TR (repetition time) is ____ |
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Definition
| time from first 90-degree RF pulse to the next 90-degree RF pulse |
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Term
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Definition
| time from 90 degree RF pulse until we collect the MR signal data that becomes our image. |
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Term
| another term for T1 relaxation is T1_______ |
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Definition
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| another term for T2 relaxation is T2_________ |
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Definition
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Definition
| recovery of longitudinal magnetization |
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Term
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Definition
| decay of transverse magnetization |
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| The 180 RF pulse is also known as the __________ pulse or _________ pulse |
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Definition
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Term
| the RF receiver coils are located in the _______ plane |
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Definition
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| T1 recovery is also known as ______ ______ or _________ recovery |
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Definition
| spin lattice, longitudinal |
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Term
| T1 recovery is 63% regrowth of _________ ___________ |
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Definition
| longitudinal magnetization |
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| T1 is primarily controlled by which parameter? |
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Definition
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| When we send in the RF pulse, what frequency do we use? |
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Definition
| the precessional frequency of the tissue we are weighting |
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| START BACK page 3 6/25 of mod 2 |
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