A measurement apparatus includes a light source, an imaging device, a signal processing circuit, and a controller. The controller causes the light source to irradiate a first portion of the scatterer, causes the element to obtain an image signal from a first target area, causes the light source to irradiate a second portion of the scatterer, and causes the element to obtain an image signal from a second target area. The circuit uses the image signals to generate data regarding the position of a target object inside the scatterer. A first distance between the first portion and a center of the first target area is equal to a second distance between the second portion and a center of the second target area, or a difference between the first and second distances is smaller than 10% of a smaller one of the first and second distances.
