Keep in mind that the images that you see in a PM layout are low-res previews. They should print in full resolution at print time.
You also have a setting in the print dialog to print image data in 'normal, optimized subsampling, low-res, omit, etc'. 'Normal' will print in the images' true resolution. The other settings will print images in lesser quality.
Pick an example graphic for this thread.... What image format are you using? What DPI? What size? Details please...