leanBodyMass {oro.pet}

Calculating the Lean Body Mass

Description

The lean body mass (LBM) is calculated according to the formula

1.1\cdot\mbox{weight}-128\cdot(\mbox{weight}/\mbox{height})^2

if male and

1.07\cdot\mbox{weight}-148\cdot(\mbox{weight}/\mbox{height})^2

if female.

The standard uptake value (SUV) is summarized using the hotspot method or by calculating total volume of the high values.

Usage

leanBodyMass(height, weight, gender)

hotSpotSUV(suv, radius = 10, type = "3D")

totalSUV(suv, mask, z, bg, local = TRUE)

Arguments

height

is a vector of heights in centimeters.

weight

is a vector of weights in kilograms.

gender

is a character vector (may be of length one) with the value “male” or “female”.

suv

is the standard uptake value (SUV).

radius

is the desired hotspot radius (units = voxels).

type

is a character string (acceptable values are 2D or 3D) that determines the dimension of the hot spot (default = 3D).

mask

is a multidimensional array of logical values.

z

is the slice index.

bg

is the estimated background SUV.

local

is a logical value.

Value

Vector of lean body mass values in kilograms.

...

Author(s)

Brandon Whitcher [e-mail]

References

Sugawara, Y., K. R. Zasadny, A. W. Neuhoff, R. L. Wahl (1999) Reevaluation of the Standardized Uptake Value for FDG: Variations with Body Weight and Methods for Correction, Radiology 213: 521–525.

See Also

standardUptakeValue

leanBodyMass

Examples

library(oro.pet)
n <- 11
h <- seq(200, 150, length=n)
w <- seq(80, 120, length=n)
cbind(h, w, leanBodyMass(h, w, "male"), leanBodyMass(h, w, "female"))