# Ultrasound Phy

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CHAPTER 1
Graphs are used to study the relationship between 2 things so you can see what the relationship is.

Unrelated: 2 items that are not associated. Ex. Hair color is unrelated to shoe size

Directly related/proportional: 2 items that are associated such that when one item increases, the other increases. The graph of 2 directly related items extends from lower left to upper right. Ex. Clothing size is directly related to one’s weight.

Related/ proportional: Is a relationship but can’t be measured. 2 items that are associated or affiliated however the relationship between the items does not have to be specified.

Inversely related/proportional: 2 items are associated such that when one item increases, the other decreases. The graph of 2 inversely related items extends from upper left to lower right. Ex. Golf score is inversely related to skill.

Reciprocal relationship: 2 numbers multiplied together, the result is 1. This is a special form of inverse relationship. Reciprocal numbers are inverse because when one increases, the other decreases. Ex. 10/1 x 1/10=1

All numerical values must have corresponding units. A number alone, without units, is ambiguous and can create uncertainty. Percents (%) don’t have units. To change units from one form to another is called unit conversion.

Metric System-Powers of Ten EXPONENT | PREFIX | SYMBOL | MEANING | 109 | Giga | G | Billion | 106 | Mega | M | million | 103 | Kilo | k | thousand | 102 | Hecto | h | Hundred | 101 | Deca | da | Ten | 10-1 | Deci | d | Tenth | 10-2 | Centi | c | Hundredth | 10-3 | Milli | m | Thousandth | 10-6 | Micro | μ | Millionth | 10-9 | Nano | n | billionth |

Exponents tell how many 0’s, tells “meaning”

Hz: cycle per second

Complementary Metric Units PAIRS | PREFIXES | ABBR. | Billions and billionths | giga & nano | G & n | Millions and millionths | mega & micro | M & | Thousands and thousandths | kilo & milli | k & m | Hundreds and

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