rss helper elem method images cakephp 2.0

I'm trying to add images to my rss feed and I'm assuming that it can be done using the elem method of the rss helper but I don't know how to use elem method properly. If images are add a different way then please explain as well. This is my rss.ctp view file:

<?php
    App::uses('Sanitize', 'Utility');
   
    $this->set('channelData', array(
        'title' => 'test',
        'link' => 'test',
        'url' => 'test',
        'description' => 'test',
        'language' => 'en-us',
        'managing-editor' => 'test',
    ));

    foreach($posts as $post) {
       
        // Clean the body text for output as the description of the rss item,
        // this needs to have only text to make sure the feed validates
        $bodyText = preg_replace('=\(.*?\)=is', '', $post['Post']['excerpt']);
        $bodyText = $this->Text->stripLinks($bodyText);
        $bodyText = Sanitize::stripAll($bodyText);
        $bodyText = $this->Text->truncate($bodyText, 400, array(
            'ending' => '...',
            'exact'  => true,
            'html'   => true,
        ));       
       
        echo $this->Rss->item(array(), array(
            'title' => $post['Post']['title'],
            'link' => array(
                'controller' => 'streams',
                'action' => 'view', $post['Post']['id']
            ),
            'guid' => array(
                'controller' => 'streams',
                'action' => 'view', $post['Post']['id']
            ),
            'description' => $bodyText,
            'pubDate' => $post['Post']['post_date'],
            //'elem' => array('media:thumbnail', array('url' => $this->Html->url('/app/webroot/'.$post['Post']['image_site_thumb'], true), 'width' => '75', 'height' => '75'), NULL, false)
            'enclosure' => 'test'
        ));
    }
?>

Here's the documentation:
http://book.cakephp.org/2.0/en/core-libraries/helpers/rss.html
http://api20.cakephp.org/class/rss-helper
http://api20.cakephp.org/file/Cake/View/Helper/RssHelper.php#

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