immagini con fpdf

[desila]

Buongiorno a tutti devo inserire delle immagini in in PDF, sto provando nel seguente modo:

<?php
require('fpdf.php');

include("../inclusioni/conf.php");

     $database = mysql_connect($dbhost,$dbuser,$dbpass);
     mysql_select_db($db,$database);
     
$sql_desc1 = "SELECT  * FROM partecipazioni WHERE od = ".$_GET['od']; 
$results1 = mysql_query($sql_desc1) or die("Cannot query the database.
" . mysql_error());
$num_rows  = mysql_num_rows($results1);


  
 //echo $num_rows;
//die();
while ($riga1 = mysql_fetch_array($results1)) {
 $images = $riga1["images"];
 


class PDF extends FPDF
{
//Page header
function Header()
{
    //Logo
    $this->Image('$images',10,8,33);
    //Arial bold 15
    $this->SetFont('Arial','B',15);
    //Move to the right
    $this->Cell(80);
    //Title
    $this->Cell(30,10,'Title',1,0,'C');
    //Line break
    $this->Ln(20);
}}

//Page footer
function Footer()
{
    //Position at 1.5 cm from bottom
    $this->SetY(-15);
    //Arial italic 8
    $this->SetFont('Arial','I',8);
    //Page number
    $this->Cell(0,10,'Page '.$this->PageNo().'/{nb}',0,0,'C');
}
}

//Instanciation of inherited class
$pdf=new PDF();
$pdf->AliasNbPages();
$pdf->AddPage();
$pdf->SetFont('Times','',12);
for($i=1;$i<=40;$i++)
    $pdf->Cell(0,10,'Printing line number '.$i,0,1);
$pdf->Output();
?>

mi da questo errore : Image file has no extension and no type was specified: $images

Nel campo images di tipo varchar ho : 91692139.jpg.