Fundamentals of Radiologic Science Study Guide Unit 1 and WS Questions and Answers

Quotient - A result obtained by dividing one quantity by another Ratio - The quantitative relation between two amounts showing the number of times one value contains or is contained within the other Proportion - A part, share, or number considered in comparative relation to a whole Adding and Subtracting Fractions - Must have common denominator a/b + c/b Multiplying Fractions - Multiple numerators then denominators 2/5 * 3/7 = 6/35 Dividing Fractions - Rewrite division problem as a multiplication problem (invert the 2nd fraction then multiply) 2/5 / 3/7 -- 2/5 * 7/3 = 14/15 Proper Fraction - Quotient 1 (9/10) Improper Fraction - Quotient 1 (13/12) % to . - Move decimal point two places to left 73.5% = .735 . to % - Move decimal point two places to right .452 = 45.2% x/y to . - Divide numerator by denominator 3/20 = 0.15 . to x/y - Put all nonzero numbers after decimal in numerator; Make denominator a 1 with as many zeros as are places behind decimal; Reduce fraction if possible .6 = 6/10 = 3/5 mAs - When you select a technique at the control panel, you are choosing how dark or how light you want the xray to be. This is called optical density (OD) and it is directly related to the milliamperage mA - Number of x-rays directed toward the patient s - The amount of time those xrays are directed toward the patient kilo - k kilo - 10^3 1000 hecto - h hecto - 10^2 100 deka - da deka - 10^1 10 deci - d deci - 10^-1 .1 1/10 centi - c centi - 10^-2 .01 1/100 milli - m milli - 10^-3 .001 1/1000