Measurement of the midpelvis with the rectovaginal pelvimeter to minimize exposure to radiation.

Abstract A rectovaginal pelvimeter, first devised over two decades ago, is reintroduced. By means of this instrument, all of the diameters of the midpelvis can be measured readily and accurately. X-ray pelvimetry can consequently be reduced to only one exposure, and even this one exposure can often be avoided. The hazard of genetic damage from exposure of the gonads to radiation can thus be minimized.