I couldn't find the exact article I was thinking of last night, but I gathered some along the same lines. I don't know if these are what you want but check them out if you wish. I didn't go into the abstracts on all, but the last was an interesting review and also touched on MRI, etc. BTW, nice pics, hippocampus I assume?
1: Ashworth R, Bolsover SR.
Spontaneous activity-independent intracellular calcium signals in the
developing spinal cord of the zebrafish embryo.
Brain Res Dev Brain Res. 2002 Dec 15;139(2):131-7.
2: Helmchen F, Fee MS, Tank DW, Denk W.
A miniature head-mounted two-photon microscope. high-resolution brain imaging
in freely moving animals.
Neuron. 2001 Sep 27;31(6):903-12.
3: Neunlist M, Zou SZ, Tung L.
Design and use of an "optrode" for optical recordings of cardiac action
potentials.
Pflugers Arch. 1992 Apr;420(5-6):611-7.
4: Bowmaster TA, Davis CC, Krauthamer V.
Excitation and detection of action potential-induced fluorescence changes
through a single monomode optical fiber.
Biochim Biophys Acta. 1991 Jan 10;1091(1):9-14.
5: Kudo Y, Akita K, Nakamura T, Ogura A, Makino T, Tamagawa A, Ozaki K,
Miyakawa A.
A single optical fiber fluorometric device for measurement of intracellular
Ca2+ concentration: its application to hippocampal neurons in vitro and in vivo.
Neuroscience. 1992 Oct;50(3):619-25.
6: Hirano M, Yama****a Y, Miyakawa A.
In vivo visualization of hippocampal cells and dynamics of Ca2+ concentration
during anoxia: feasibility of a fiber-optic plate microscope system for in vivo
experiments.
Brain Res. 1996 Sep 2;732(1-2):61-8.
7: Thayer SA, Sturek M, Miller RJ.
Measurement of neuronal Ca2+ transients using simultaneous microfluorimetry and
electrophysiology.
Pflugers Arch. 1988 Jul;412(1-2):216-23.
8: Ligeti L, Mayevsky A, Ruttner Z, Kovach AG, McLaughlin AC.
Can the Indo-1 fluorescence approach measure brain intracellular calcium in
vivo? A multiparametric study of cerebrocortical anoxia and ischemia.
Cell Calcium. 1997 Feb;21(2):115-24.
9: Shortreed M, Kopelman R, Kuhn M, Hoyland B.
Fluorescent fiber-optic calcium sensor for physiological measurements.
Anal Chem. 1996 Apr 15;68(8):1414-8.
10: Thorsrud BA, Harris C.
Real time micro-fiberoptic monitoring of endogenous fluorescence in the rat
conceptus during hypoxia.
Teratology. 1993 Oct;48(4):343-53.
11: Papworth GD, Delaney PM, Bussau LJ, Vo LT, King RG.
In vivo fibre optic confocal imaging of microvasculature and nerves in the rat
vas deferens and colon.
J Anat. 1998 May;192 ( Pt 4):489-95.
12: Thomas TP, Myaing MT, Ye JY, Candido K, Kotlyar A, Beals J, Cao P, Keszler
B, Patri AK, Norris TB, Baker JR Jr.
Detection and analysis of tumor fluorescence using a two-photon optical fiber
probe.
Biophys J. 2004 Jun;86(6):3959-65.
13: Libersat F, Mizrahi A.
In situ visualization and photoablation of individual neurons using a low cost
fiber optic based system.
J Neurosci Methods. 1996 Aug;67(2):157-62.
15: Brecht M, Fee MS, Garaschuk O, Helmchen F, Margrie TW, Svoboda K, Osten P.
Novel approaches to monitor and manipulate single neurons in vivo.
J Neurosci. 2004 Oct 20;24(42):9223-7. No abstract available.