Photoshop images resizing when placed in Indesign

Hi,

I've created an image in Photoshop whih is 960 px wide and 600 px in length.  I have set up a document in Indesign with the same dimensions.  When I place the .psd file in Indesign, it comes in at 230.4 x 144 px.  Why is it not coming in at 960x600, the size it is in Photoshop?  My rulers and measurements are all set to px, I've checked.

If anyone can help I'd be most grateful!

Thanks,

Omar