Bootable Tiger disk image (in Lion)

Hi
Just interested to know if anyone knows if it's possible to read a (bootable) disk image of a Tiger based Mac into a Lion based Mac?
I don't want to go into a really complicated business, as it's not worth it. But since I have a bootable disk image - made on Retrospect - of my old laptop (running tiger) it would interesting to be able to access it to collect old files and the like.
Any suggestions?
Thanks in advance.

Hi Thomas and Shootist
It's a disk image on an external disk. The disk image is a bootable copy which I used (and still can on an old Mac) open up when needed to restore past images ...... before Time Machine came in.
I did try just booting up from the external disc, but all I got was the computer opening up in single user mode. I didn't bother going any further as it's not worth the time, hence the original question. I imagine that they are indeed .dmg files, as that's the system that Retrospect (Express) used back then (2007) if my memory serves me well.
Thanks.
p.s. As for accessing files you'd need to re-install a Retrospect system as RS used to build back-up sets which it then used to catalogue files between systems. You of course need back-set A + back-up set B to work as one reads from the other. As for the disk image, I really must say I hadn't thought about it as normally an image is (naturally) an image of the original (files, library and the lot), which is why I wondered why it won't just read it as normal. I seem to remember that Mac also changed it's system at that time due to PowerPC and intel etc, maybe there's an issue there.

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starbux48 wrote:
I would like to upgrade finally to OS X Lion. Before I do that I would like to make an image backup using something like Super Duper to an external USB 2.0 disk drive. I would like this to be a bootable image. Can I do this?
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http://blog.gete.net/lion-diskmaker-us/
http://osxdaily.com/2011/07/08/make-a-bootable-mac-os-x-10-7-lion-installer-from -a-usb-flash-drive/
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Backup Software Recommendations
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http://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/IEEE_1394_Firewire_PCI_ Expansion_Card_Digon3.jpg/800px-IEEE_1394_Firewire_PCI_Expansion_Card_Digon3.jpg
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