How to get custom metabox image field?

i have custom metabox with the image field, i can upload image from wp-admin to this metabox, metabox code

array(
            'name' => 'Burst Image',
            'desc' => 'Crop your image to exact dimension before upload!',
            'id' => 'burst_img',
            'type' => 'image'
        )

i have code like $burst_img= get_post_meta( $post->ID, 'burst_img', true ); to get the metabox , but it doesn’t work, how can i get the metabox image ?

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