  A beam imaging detector was developed by coupling a multi-strip anode with
delay line readout to an E$\times$B microchannel plate (MCP) detector. This
detector is capable of measuring the incident position of the beam particles in
one-dimension. To assess the spatial resolution, the detector was illuminated
by an $\alpha$-source with an intervening mask that consists of a series of
precisely-machined slits. The measured spatial resolution was 520$\mu$m FWHM,
which was improved to 413$\mu$m FWHM by performing an FFT of the signals,
rejecting spurious signals on the delay line, and requiring a minimum signal
amplitude. This measured spatial resolution of 413$\mu$m FWHM corresponds to an
intrinsic resolution of 334$\mu$m FWHM when the effect of the finite slit width
is de-convoluted. To understand the measured resolution, the performance of the
detector is simulated with the ion-trajectory code SIMION.
