Optical apparatus for use with a medical imager

An optical apparatus comprising:

• a disposable non-magnetic optical fibre probe configured for coupling light into a sample and for receiving light from the sample for performing Raman spectroscopy;
• and
• a non-magnetic optical extension releasably connected to the disposable non-magnetic optical fibre probe and configured for transmitting light into the disposable non-magnetic optical fibre probe and for receiving light from the disposable non-magnetic optical fibre probe,
• wherein:
• the disposable non-magnetic optical fibre probe comprises a first optical fibre for coupling light into the sample and a plurality of second optical fibres for receiving light from the sample,
• the first and second fibres are arranged side-by-side, the first fibre being directly in contact with each second fibre at one end of each of the first and second fibres and connected, at each of said one ends, within a common sleeve to form a probe head,
• each of the first and second fibres has a corresponding further end opposite said one end, each of the further ends of the first and second fibres being separated from one another,
• the probe head does not contain any metallic substances,
• the disposable non-magnetic optical fibre probe is adapted to be fitted in a non-magnetic biopsy needle
• a tip of each second fibre is aligned in an axial direction with a tip of each of the one or more other second fibres, and
• the tip of the first fibre protrudes axially beyond the tips of the plurality of second fibres.