Get Magento Manufacturer Logos for Current category in Category Page

Hello,

I'm using this code to get Magento manufacturers' label in current category page. (to show brands related to current category not all the brands):

$category   = Mage::registry('current_category');
$layer   = Mage::getSingleton('catalog/layer');
$layer->setCurrentCategory($category);
$attributes = $layer->getFilterableAttributes();
$manufacturers = array();
foreach ($attributes as $attribute) {
    if ($attribute->getAttributeCode() == 'manufacturer') {
        $filterBlockName = 'catalog/layer_filter_attribute';
        $result = Mage::app()->getLayout()->createBlock($filterBlockName)->setLayer($layer)->setAttributeModel($attribute)->init();
        foreach($result->getItems() as $option) {
            $manufacturers[$option->getValue()] = $option->getLabel();
        }
    }
}

I've added above code in a custom phtml file and add an custom cms block to category page pointing to this phtml file.

Actually it works fine in category pages. All I need is to get manufacturer IMAGE instead of their LABEL.

By the way I've used var_dump($option) to find the image or image url, but there is no such a thing for $option!

Please help me what to do.

Thanks