How to display mysql blob image in php form product table

After two days of search I come here with the hope of finding a solution. im trying to display the images that uploaded into my database in the Product table but i dont know how to build the right way on php file

$result = mysql_query($selectString);

                    while ($row = mysql_fetch_assoc($result))
                    {
                    echo("<tr>");
                    foreach($row as $index=>$value)
                    //to show the Product image. here is what im not sure about it 

                    if($index == "Product")
                    {
                        echo("<td><img src = $value alt = 'Product_Image'></td>");
                    }
                    else{
                        echo("<td>$value</td>");                    

                    }