ng-style background-image with angular

<div class="Table-row-item rowHas_img">

    <div class="table_row_Img" ng-style="getBackgroundStyle(data.sex)"></div>

</div>

$scope.getBackgroundStyle = function(gender) {

    var imagepath = 'https://s3.amazonaws.com/37assets/svn/1065-IMG_2529.jpg';

    if (gender === 'M')

        imagepath = 'http://pis.net.in/wp-content/uploads/2015/04/man1.png ';

    else if (gender === 'F') {

        imagepath = 'http://www.freeiconspng.com/uploads/female-icon-27.png';

    }

    return {

        'background-image': 'url(' + imagepath + ')'

    }

}