aan –toronto, april 11, 2010
DESCRIPTION
AAN –Toronto, April 11, 2010. Development of a harmonized protocol for hippocampal tracing An EADC-ADNI joint effort INTRODUCTION. BACKGROUND Hippocampal volume as a diagnostic marker. Structure: MR hippo volumetry. Function: FDG PET. Amyloid deposits: PET. Biochemistry: CSF - PowerPoint PPT PresentationTRANSCRIPT
AAN –Toronto, April 11, 2010
Development of a harmonized protocol for hippocampal tracing
An EADC-ADNI joint effort
INTRODUCTION
Structure:MR hippo volumetry
Alz
he
ime
r
Normal
CS
F t
ota
l ta
u
CSF Abeta42
Biochemistry:CSF tau/Abeta
Function:FDG PET
Amyloid deposits:PET
BACKGROUNDHippocampal volume as a diagnostic marker
Dubois, Feldman et al., Lancet Neurol 2007
Geuze et al., Mol Psychiatry 2005;10:147-59
Ref. Med borderLat border
Inf border
Norm. hippo vol (cm3)
Left Right
Watson et al.
Mesial edge of temporal lobe
Temp horn of lat ventr
Incl subicular complex & uncal cleft w/ border separating subicular complex from parahippo gyrus
4.903 5.264
Zipursky et al.
Regional outline at choroidal fissure
Not mentioned
The interface of hippocampal tissue and parahippocampal gyrus white matter
1.990 2.070
BACKGROUNDThe effect of segmentation protocols
on hippocampal volume
BACKGROUNDHippocampal volume as an outcome measure
in trials of disease modifiersDrug Study Effect Segment. method Ref
Tramiprosate Alphase 68% (100 mg)120% (150 mg)
Not mentioned Gauthier et al., JNHA 2009
Atorvastatin ADCLT “CHV* mm³ -134±174 vs -583±354 p> .05”
Manual protocolInsausti et al., 1998 AJNR;
Machulda et al., 2001, Neuroimage
Sparks et .a,l CCJM,2008
LEADe “significant at p<.05”
MIDAS(semiautomated)
Jones et al., Alz&Dem 2008Feldman et al., Neurology 2010
AN1792 “CHV* % 3.78±2.63 vs 2.86±3.19
p = 0.124”
Manual protocolWatson et al., 1992, Neurology
Fox N et al., Neurology, 2005
Xaliproden Sanofi-Aventis Trials
“significant atrophy” § Not mentioned From Vellas B et al. (Review), Lancet Neurol.,2008
Donepezil “CHV* % -6.14±3.49vs -4.50±2.28 p= 0.07”
ε4 carriers only
Manual protocolJack et al., 1989;Radiology
Jack et al., 2004; Neurology
Jack CR et al., Neurobiol. Aging, 2008
* CHV= Change in hippocampal volume; § referenced link not working
BACKGROUNDHippocampal volume (manual segmentation)
as gold standard for automated segmentation algorithms
Morey et al., NeuroImage 2009
To Harmonize Available Protocols for Manual Hippocampal Segmentation
To Test the Validity of the Harmonized Protocol
AIMS
F Barkhof/P Scheltens Amsterdam B Dubois/S Leherici ParisN Fox LondonGB Frisoni BresciaH Hampel/J Pantel FrankfurtA Simmons LondonH Soininen KuopioS Teipel RostockLO Wahlund Stockholm
THE WORKGROUPEADC
CR Jack Jr Rochester, MNG Barzokis UCLA, CAD Bennet Chicago, ILJ Csernansky NorthW U, WAC DeCarli UC Davis, CAM De Leon New York, NYJ Kaye Portland, ORR Killiany Boston USM, MAPM Thompson LoNI, UCLA, CAM Weiner/S Mueller UCSF/VAMC
THE WORKGROUP ADNI
THE WORKGROUPother relevant hippo experts
R Camicioli Univ Alberta, CanadaJ O’Brien NewCastle, UKJ Pruessner McGill, QC, Canada
EADC-ADNI P.I.sB Vellas Toulouse, FranceB Winblad Stockholm, SwedenM Weiner UCSF, US
Population-based studiesM Breteler / T Den Heijer Rotterdam Scan StudyP Sachdev/ JJ Maller PATH through lifeL Launer NIA BethesdaW Jagust Berkeley
THE WORKGROUPAdvisory Boards
Statistical BoardS Duchesne Laval Univ, CanadaL Collins MNI, McGill, MontrealP Pasqualetti AFaR, Rome
Clinical AdvisorPJ Visser Maastricht, The Netherlands
Dissemination/EducationG Waldemar Copenhagen, Denmark
THE WORKGROUPBoards
Marina Boccardi psychologist, PhDRossana Ganzola psychologistEnrica Cavedo psychologistMichela Pievani mathematicianAnna Caroli mathematicianAlberto Redolfi bioinformaticist
THE WORKGROUPPersonnel in Brescia
AAN –Toronto, April 11, 2010
Development of a harmonized protocol for hippocampal tracing
An EADC-ADNI joint effort
METHODS
Operationalization of protocols’ differences and extraction of tracing units
Quantification of tracing units’ features
Harmonized protocol
METHODS
Selection criteria
i) Being based on 3D T1 MRI with field strength greater than 1 Tesla
ii) Providing explicit description of landmarks for tracing of hippocampal borders
iii) Being validated on AD/MCI samples, or being widely adopted in the literature about AD.
OPERATIONALIZATIONSelection of segmentation protocols
Plane of tracing: AC-PC line;
Normalization to the Talairach space
Tracing start from the tail of
hippocampus to the hippocampal head
In the following slices, you can find the
hippocampal tracing on consecutive
coronal slices (1.5T) of the control subject and AD patient according to Pruessner's criteria
Areas explicitly excluded
Most anterior slice
Andreas-Retzius gyrus (ARG), the part
of the FG that is adjacent to ARG, crus
of fornix
slice w here one of the follow ing is visible: alveus,
temporal horn of lateral ventricle (uncal recess) or
amygdala
Lateral border Inferior border Medial border
HE
AD temporal horn of
lateral ventricle (uncal recess)
uncal cleft (if visible) CSF of ambient cistern
BO
DY temporal horn of
lateral ventricle (uncal recess)
White matter of the parahippocampal
gyrusCSF of ambient cistern
TA
IL
Discrimination of HT from FG and crus of fornix using arbitrary
borders
adjacent w hite matter atrium of lateral ventricle
Areas explicitly included
CA regions, dentate gyrus, subiculum,
alveus, f imbria, part of the fasciolar gyrus (FG)
BOUNDARIES
Discrimination of HT from ARG using arbitrary borders
Most posterior slice
slice w here an ovoid mass of gray matter started to appear
inferomedially to the trigone of the lateral ventricle
Superior border
temporal horn of lateral ventricle (uncal recess) and alveus
superior excess of the quadrigeminal cistern
OPERATIONALIZATIONProtocols’ features extraction
Tracings carried out on a control and an
AD subject from the ADNI dataset
Tracings sent to the Authors for correction or approval
OPERATIONALIZATIONPrototypical tracings
CTRL
Most posterior slice : slice where an ovoid mass of gray matter (1) started to appear inferomedially of the atrium of lateral ventricle (2)
Sagittalview
2= Atrium of lateral ventricle4= Parahippocampal gyrus5= Gyrus dentatus6= Cornu Ammonis7= Gyrus fasciolaris8= Gyrus of Andreas-Retzius9= Isthmus
The fornix can be excluded by a horizontal line (in fuchsia) from the superior border of the quadrigeminal cistern (3) to the lateral ventricle (2).Part of gyrus fasciolaris (7) and of Andreas-Retzius gyrus (8) can be excluded by a vertical line (in red) from the medial end of the lateral ventricle (2) down to the parahippocampal gyrus (4).
AD
Most posterior slice : slice where an ovoid mass of gray matter (1) started to appear inferomedially of the atrium of lateral ventricle (2)
2= Atrium of lateral ventricle4= Parahippocampal gyrus5= Gyrus dentatus6= Cornu Ammonis7= Gyrus fasciolaris8= Gyrus of Andreas Retzius9= IsthmusSagittal
view
In AD subjects the cerebral structures are atrophic, lateral ventricle (2) and ambient cistern (3) result enlarged. Therefore,the lines used to exclude the gyrus fasciolaris, the Andreas-Retzius gyrus and the fornix do not intersect the hippocampal tail. That being so, is there another way to exclude the gyrus fasciolaris, the Andreas-Retzius gyrus and the fornix in these subjects?
Areas explicitly excluded
Most anterior slice
Andreas-Retzius gyrus (ARG), the part
of the FG that is adjacent to ARG, crus
of fornix
slice w here one of the follow ing is visible: alveus,
temporal horn of lateral ventricle (uncal recess) or
amygdala
Lateral border Inferior border Medial border
HE
AD temporal horn of
lateral ventricle (uncal recess)
uncal cleft (if visible) CSF of ambient cistern
BO
DY temporal horn of
lateral ventricle (uncal recess)
White matter of the parahippocampal
gyrusCSF of ambient cistern
TA
IL
Discrimination of HT from FG and crus of fornix using arbitrary
borders
adjacent w hite matter atrium of lateral ventricle
Areas explicitly included
CA regions, dentate gyrus, subiculum,
alveus, f imbria, part of the fasciolar gyrus (FG)
BOUNDARIES
Discrimination of HT from ARG using arbitrary borders
Most posterior slice
slice w here an ovoid mass of gray matter started to appear
inferomedially to the trigone of the lateral ventricle
Superior border
temporal horn of lateral ventricle (uncal recess) and alveus
superior excess of the quadrigeminal cistern
For each protocol: features extraction, tracing and author’s certification
AD
CTRL
X 10
OPERATIONALIZATIONAuthors’ check
OPERATIONALIZATIONExtraction of similarities and differences
Areas explicitly excluded
Most anterior slice
choroid plexis of inferior horn, amygdala
level at w hich the alveus distinguishes the amygdala
from hippocampus
Lateral border Inferior border Medial border
HE
AD inferior horn of the
lateral ventriclew hite matter joining the parahippocampal gyrus
angular bundle
BO
DY
same as head same as head same as head
TA
IL same as head same as head same as head
BOUNDARIES
Areas explicitly included
portion of subiculum, CA f ields
same as head
Most posterior slice
slice in w hich the fornix appeared as a solid w hite line through the collateral trigone
Superior border
inferior horn of the lateral ventricle
same as head
Harmonized language
Reduction of redundancy
Tracing units and subunits
Areas explicitly excluded
Most anterior slice
Andreas-Retzius gyrus (ARG), the part
of the FG that is adjacent to ARG, crus
of fornix
slice w here one of the follow ing is visible: alveus,
temporal horn of lateral ventricle (uncal recess) or
amygdala
Lateral border Inferior border Medial border
HE
AD temporal horn of
lateral ventricle (uncal recess)
uncal cleft (if visible) CSF of ambient cistern
BO
DY temporal horn of
lateral ventricle (uncal recess)
White matter of the parahippocampal
gyrusCSF of ambient cistern
TA
IL
Discrimination of HT from FG and crus of fornix using arbitrary
borders
adjacent w hite matter atrium of lateral ventricle
Areas explicitly included
CA regions, dentate gyrus, subiculum,
alveus, f imbria, part of the fasciolar gyrus (FG)
BOUNDARIES
Discrimination of HT from ARG using arbitrary borders
Most posterior slice
slice w here an ovoid mass of gray matter started to appear
inferomedially to the trigone of the lateral ventricle
Superior border
temporal horn of lateral ventricle (uncal recess) and alveus
superior excess of the quadrigeminal cistern
axial + coronal + sagittal
Cornu Ammonis, subiculum, vertical digitation alveus and fimbria
Medial border Lateral border
HE
AD
Gyrus ambiensidentified by the
contrast of the WM or CSF
BO
DY
The medial border of the HC w as continued w ith a straight horizontal line (marking the inferior border
of CA and subiculum) across the cortex of the PHG. The cortex below this line w as considered
the PHG, and the cortex above this line w as included as a part of the HC
identified by the contrast of the WM
or CSF
TA
IL
The medial border of the HC w as continued w ith a straight horizontal line (marking the inferior border
of CA and subiculum) across the cortex of the PHG. The cortex below this line w as considered
the PHG, and the cortex above this line w as included as a part of the HC
identified by the contrast of the WM
or CSF
WM of parahippocampal gyrus
WM of parahippocampal gyrus
Superior border
identified by the contrast of the WM or CSF
identified by the contrast of the WM or CSF
WM of parahippocampal gyrus (PHG)
Areas explicitly included Plane tracing
identified by the contrast of the WM or CSF, and Thalamus and
caudate nucleus
Most posterior slice
coronal section in w hich the hippocampus first appeared
adjacent to the trigone of lateral venticle
Areas explicitly excluded
Most anterior slice
the separation of amygdala and hippocampal head w as
facilitated by sagittal and transverse view s
Inferior border
BOUDARIES
Line outlining the contour of white matter of parahippocampal gyrus [Pa,S]
Orizontal line from the highest medial point of the parahippocampalWM to the cistern [B,H,J¥]
Oblique line with same inclination of parahippocampalWM, connecting the inferior part of the subiculum to the quadrigeminal cistern [K,L,M¥]
45° line connecting the most inferior part of the subiculum medially to the cistern (head and body) [Pr]
vertical line from the CA to the WM of the parahippocampalgyrus [C]
Separation subiculum/enthorinal cortex
Horizontal line from the superior border of the quadrigeminal cistern to the lateral ventricle (tail) [Pr]
Upper border of alveus/fimbria[C,J,L,M,Pr]
Lower border of alveus/fimbria[B,H,K,Pa,S]
Superior border
Where gray matter is visible inferomedially to the trigone of the lateral ventricle [H,M•,Pa•,Pr]
Where the crura of the fornicesare seen in full profile on both sides [J,S]
Where crus of fornix is visible in full profile [C,K,L]
Where inferior and superior colliculiare jointly visualized [B]
Most posterior slice
AC-PC line [H,K,M,Pa,Pr]Axis of hippocampus [B,C,J,L,S]
Plane of tracing
Line outlining the contour of white matter of parahippocampal gyrus [Pa,S]
Orizontal line from the highest medial point of the parahippocampalWM to the cistern [B,H,J¥]
Oblique line with same inclination of parahippocampalWM, connecting the inferior part of the subiculum to the quadrigeminal cistern [K,L,M¥]
45° line connecting the most inferior part of the subiculum medially to the cistern (head and body) [Pr]
vertical line from the CA to the WM of the parahippocampalgyrus [C]
Separation subiculum/enthorinal cortex
Horizontal line from the superior border of the quadrigeminal cistern to the lateral ventricle (tail) [Pr]
Upper border of alveus/fimbria[C,J,L,M,Pr]
Lower border of alveus/fimbria[B,H,K,Pa,S]
Superior border
Where gray matter is visible inferomedially to the trigone of the lateral ventricle [H,M•,Pa•,Pr]
Where the crura of the fornicesare seen in full profile on both sides [J,S]
Where crus of fornix is visible in full profile [C,K,L]
Where inferior and superior colliculiare jointly visualized [B]
Most posterior slice
AC-PC line [H,K,M,Pa,Pr]Axis of hippocampus [B,C,J,L,S]
Plane of tracing
OPERATIONALIZATIONExtraction of similarities and differences
Areas explicitly excluded
Most anterior slice
choroid plexis of inferior horn, amygdala
level at w hich the alveus distinguishes the amygdala
from hippocampus
Lateral border Inferior border Medial border
HE
AD inferior horn of the
lateral ventriclew hite matter joining the parahippocampal gyrus
angular bundle
BO
DY
same as head same as head same as head
TA
IL same as head same as head same as head
BOUNDARIES
Areas explicitly included
portion of subiculum, CA fields
same as head
Most posterior slice
slice in w hich the fornix appeared as a solid w hite line through the collateral trigone
Superior border
inferior horn of the lateral ventricle
same as head
Areas explicitly excluded
Most anterior slice
Andreas-Retzius gyrus (ARG), the part
of the FG that is adjacent to ARG, crus
of fornix
slice w here one of the follow ing is visible: alveus,
temporal horn of lateral ventricle (uncal recess) or
amygdala
Lateral border Inferior border Medial border
HE
AD temporal horn of
lateral ventricle (uncal recess)
uncal cleft (if visible) CSF of ambient cistern
BO
DY temporal horn of
lateral ventricle (uncal recess)
White matter of the parahippocampal
gyrusCSF of ambient cistern
TA
IL
Discrimination of HT from FG and crus of fornix using arbitrary
borders
adjacent w hite matter atrium of lateral ventricle
Areas explicitly included
CA regions, dentate gyrus, subiculum,
alveus, f imbria, part of the fasciolar gyrus (FG)
BOUNDARIES
Discrimination of HT from ARG using arbitrary borders
Most posterior slice
slice w here an ovoid mass of gray matter started to appear
inferomedially to the trigone of the lateral ventricle
Superior border
temporal horn of lateral ventricle (uncal recess) and alveus
superior excess of the quadrigeminal cistern
Plane of tracing
Axis of hippocampus [B,C,J,L,S]
AC-PC line [H,K,M,Pa,Pr]
Most posterior slice
Where inferior and superior colliculi are jointly visualized [B]
Where crus of fornix is visible in full profile [C,K,L]
Where the crura of the fornices are seen in full profile on both sides [J•,S]
Where gray matter is visible inferomedially to the trigone of the lateral ventricle [H,M•,Pa•,Pr]
Superior border
Lower border of alveus/fimbria [B,H,K,Pa,S]
Upper border of alveus/fimbria [C,J,L,M,Pr]
Horizontal line from the superior border of the quadrigeminal cistern to the lateral ventricle (tail) [Pr]
Separation subiculum/enthorinal cortex
vertical line from the CA to the WM of the parahippocampal gyrus [C]
45° line connecting the most inferior part of the subiculum medially to the cistern (head and body) [Pr]
Oblique line with same inclination of parahippocampal WM, connecting the inferior part of the subiculum to the quadrigeminal cistern [K,L,M¥]
Orizontal line from the highest medial point of the parahippocampal WM to the cistern [B,H,J¥]
Line outlining the contour of white matter of parahippocampal gyrus [Pa,S]
Operationalization of protocols’ differences
Quantification of tracing units’ features
Harmonized protocol
METHODS
Contribution to hippo volume in control and AD
Effect on re-test variability
Contribution to differences between AD and controls
QUANTIFICATION OF TRACING UNITS’ FEATURES
Operationalization of protocols’ differences
Quantification of tracing units’ features
Harmonized protocol
METHODS
Participants to a Delphi panel based on:
expertise in hippocampal anatomy
manual tracing scientific production
Assisted decisions based on:
Low variability, highly informative.. ..included in harmonized protocol
High variability, little informative.. ..excluded from harmonized prot
HARMONIZED PROTOCOL
Validation with neuropathological data
Comparison with currently used protocols
Public tracings and probability maps
Standard environment for tracing, learning, and certification
HARMONIZED PROTOCOLValidation & implementation
AAN –Toronto, April 11, 2010
Development of a harmonized protocol for hippocampal tracing
An EADC-ADNI joint effort
EARLY RESULTS
Protocols’ features extraction & differences operationalization
Modeling & computations of the operationalized differences
Discussion
EARLY RESULTS
B Bartzokis G, et al. Psychiatry Res 1998;82:11-24
C Convit A, et al. Neurobiol Aging 1997;18:131-8
H Haller JW, et al. Radiology 1997;202:504-10
J Jack CR Jr. Epilepsia 1994;35 - Suppl 6:S21-9
K Killiany RJ, et al. Arch Neurol 1993;50:949-54
L Lehéricy S, et al. Am J Neuroradiol 1994;15:929-37
M Malykhin NV, et al. Psychiatry Res 2007;155:155-65
Pa Pantel J, et al. Hippocampus 2000;10:752-8
Pr Pruessner JC, et al. Cereb Cortex 2000;10:433-42
S Soininen HS, et al. Neurology 1994;44:1660-8
PROTOCOLS’ FEATURES EXTRACTION
http://www.hippocampal-protocol.net
PROTOCOLS’ FEATURES EXTRACTION
Areas explicitly excluded
Most anterior slice
choroid plexis of inferior horn, amygdala
level at w hich the alveus distinguishes the amygdala
from hippocampus
Lateral border Inferior border Medial border
HE
AD inferior horn of the
lateral ventriclew hite matter joining the parahippocampal gyrus
angular bundle
BO
DY
same as head same as head same as head
TA
IL same as head same as head same as head
BOUNDARIES
Areas explicitly included
portion of subiculum, CA f ields
same as head
Most posterior slice
slice in w hich the fornix appeared as a solid w hite line through the collateral trigone
Superior border
inferior horn of the lateral ventricle
same as headAreas explicitly
excluded Most anterior slice
Andreas-Retzius gyrus (ARG), the part
of the FG that is adjacent to ARG, crus
of fornix
slice w here one of the follow ing is visible: alveus,
temporal horn of lateral ventricle (uncal recess) or
amygdala
Lateral border Inferior border Medial border
HE
AD temporal horn of
lateral ventricle (uncal recess)
uncal cleft (if visible) CSF of ambient cistern
BO
DY temporal horn of
lateral ventricle (uncal recess)
White matter of the parahippocampal
gyrusCSF of ambient cistern
TA
IL
Discrimination of HT from FG and crus of fornix using arbitrary
borders
adjacent w hite matter atrium of lateral ventricle
Areas explicitly included
CA regions, dentate gyrus, subiculum,
alveus, f imbria, part of the fasciolar gyrus (FG)
BOUNDARIES
Discrimination of HT from ARG using arbitrary borders
Most posterior slice
slice w here an ovoid mass of gray matter started to appear
inferomedially to the trigone of the lateral ventricle
Superior border
temporal horn of lateral ventricle (uncal recess) and alveus
superior excess of the quadrigeminal cistern
axial + coronal + sagittal
Cornu Ammonis, subiculum, vertical digitation alveus and fimbria
Medial border Lateral border
HE
AD
Gyrus ambiensidentified by the
contrast of the WM or CSF
BO
DY
The medial border of the HC w as continued w ith a straight horizontal line (marking the inferior border
of CA and subiculum) across the cortex of the PHG. The cortex below this line w as considered
the PHG, and the cortex above this line w as included as a part of the HC
identified by the contrast of the WM
or CSF
TA
IL
The medial border of the HC w as continued w ith a straight horizontal line (marking the inferior border
of CA and subiculum) across the cortex of the PHG. The cortex below this line w as considered
the PHG, and the cortex above this line w as included as a part of the HC
identified by the contrast of the WM
or CSF
WM of parahippocampal gyrus
WM of parahippocampal gyrus
Superior border
identified by the contrast of the WM or CSF
identified by the contrast of the WM or CSF
WM of parahippocampal gyrus (PHG)
Areas explicitly included Plane tracing
identified by the contrast of the WM or CSF, and Thalamus and
caudate nucleus
Most posterior slice
coronal section in w hich the hippocampus first appeared
adjacent to the trigone of lateral venticle
Areas explicitly excluded
Most anterior slice
the separation of amygdala and hippocampal head w as
facilitated by sagittal and transverse view s
Inferior border
BOUDARIES
PROTOCOLS’ FEATURES EXTRACTION
Harmonized language
Reduction of redundancy
Tracing units and subunits
Line outlining the contour of white matter of parahippocampal gyrus [Pa,S]
Orizontal line from the highest medial point of the parahippocampalWM to the cistern [B,H,J¥]
Oblique line with same inclination of parahippocampalWM, connecting the inferior part of the subiculum to the quadrigeminal cistern [K,L,M¥]
45° line connecting the most inferior part of the subiculum medially to the cistern (head and body) [Pr]
vertical line from the CA to the WM of the parahippocampalgyrus [C]
Separation subiculum/enthorinal cortex
Horizontal line from the superior border of the quadrigeminal cistern to the lateral ventricle (tail) [Pr]
Upper border of alveus/fimbria[C,J,L,M,Pr]
Lower border of alveus/fimbria[B,H,K,Pa,S]
Superior border
Where gray matter is visible inferomedially to the trigone of the lateral ventricle [H,M•,Pa•,Pr]
Where the crura of the fornicesare seen in full profile on both sides [J,S]
Where crus of fornix is visible in full profile [C,K,L]
Where inferior and superior colliculiare jointly visualized [B]
Most posterior slice
AC-PC line [H,K,M,Pa,Pr]Axis of hippocampus [B,C,J,L,S]
Plane of tracing
Line outlining the contour of white matter of parahippocampal gyrus [Pa,S]
Orizontal line from the highest medial point of the parahippocampalWM to the cistern [B,H,J¥]
Oblique line with same inclination of parahippocampalWM, connecting the inferior part of the subiculum to the quadrigeminal cistern [K,L,M¥]
45° line connecting the most inferior part of the subiculum medially to the cistern (head and body) [Pr]
vertical line from the CA to the WM of the parahippocampalgyrus [C]
Separation subiculum/enthorinal cortex
Horizontal line from the superior border of the quadrigeminal cistern to the lateral ventricle (tail) [Pr]
Upper border of alveus/fimbria[C,J,L,M,Pr]
Lower border of alveus/fimbria[B,H,K,Pa,S]
Superior border
Where gray matter is visible inferomedially to the trigone of the lateral ventricle [H,M•,Pa•,Pr]
Where the crura of the fornicesare seen in full profile on both sides [J,S]
Where crus of fornix is visible in full profile [C,K,L]
Where inferior and superior colliculiare jointly visualized [B]
Most posterior slice
AC-PC line [H,K,M,Pa,Pr]Axis of hippocampus [B,C,J,L,S]
Plane of tracing
Plane of tracing
Axis of hippocampus [B,C,J,L,S]
AC-PC line [H,K,M,Pa,Pr]
Most posterior slice
Where inferior and superior colliculi are jointly visualized [B]
Where crus of fornix is visible in full profile [C,K,L]
Where the crura of the fornices are seen in full profile on both sides [J,S]
Where gray matter is visible inferomedially to the trigone of the lateral ventricle [H,M•,Pa•,Pr]
Superior border
Lower border of alveus/fimbria [B,H,K,Pa,S]
Upper border of alveus/fimbria [C,J,L,M,Pr]
Horizontal line from the superior border of the quadrigeminal cistern to the lateral ventricle (tail) [Pr]
Separation subiculum/enthorinal cortex
vertical line from the CA to the WM of the parahippocampal gyrus [C]
45° line connecting the most inferior part of the subiculum medially to the cistern (head and body) [Pr]
Oblique line with same inclination of parahippocampal WM, connecting the inferior part of the subiculum to the quadrigeminal cistern [K,L,M¥]
Orizontal line from the highest medial point of the parahippocampal WM to the cistern [B,H,J¥]
Line outlining the contour of white matter of parahippocampal gyrus [Pa,S]
No longer an issue thanks to software for
3D navigation
PROTOCOLS’ FEATURES EXTRACTIONMost anterior slice
H. Haller-Csernansky et al 1997 K. Killiany et al 1993 M. Malykhin et al 2007Pa. Pantel et al 2000Pr. Pruessner et al 2000
B. Bartzokis et al 1998 C. Convit et al 1997 J. Jack 1994L. Lehéricy et al 1994 S. Soininen H et al 1994
Axis of hippocampus AC-PC
PROTOCOLS’ FEATURES EXTRACTIONPlane of tracing
PROTOCOLS’ FEATURES EXTRACTIONMost posterior slice
A. Level where the inferior (1) and superior (2) colliculi are
jointly visualized [B]
B. Slice where the crus of fornix is visible in full profile (3) [C, K,
L]
C. Slice where the crura of fornices on both sides are seen
in full profile (4, 5) [J, S]
D. Slice where an ovoid mass of gray matter (6) appears
inferomedially to the trigone of the lateral ventricle (posterior to
anterior) [H, M, Pa, Pr]
Yellow = Alveus
PROTOCOLS’ FEATURES EXTRACTIONAlveus
Yellow = Fimbria
PROTOCOLS’ FEATURES EXTRACTIONFimbria
PROTOCOLS’ FEATURES EXTRACTIONUpper border
PROTOCOLS’ FEATURES EXTRACTIONMedial borderVertical line [C]
45° line
[Pr]
Line with same inclination WM
[K, L, M]
Horizontal line
[B, H, J]
Morphological details
[Pa, S]
EARLY RESULTS
Protocols’ features extraction & differences operationalization
Modeling & computations of the operationalized differences
Discussion
Plane of tracing
Axis of hippocampus [B,C,J,L,S]
AC-PC line [H,K,M,Pa,Pr]
Most posterior slice
Where inferior and superior colliculi are jointly visualized [B]
Where crus of fornix is visible in full profile [C,K,L]
Where the crura of the fornices are seen in full profile on both sides [J,S]
Where gray matter is visible inferomedially to the trigone of the lateral ventricle [H,M•,Pa•,Pr]
Superior border
Lower border of alveus/fimbria [B,H,K,Pa,S]
Upper border of alveus/fimbria [C,J,L,M,Pr]
Separation subiculum/enthorinal cortexvertical line from the CA to the WM of the parahippocampal gyrus [C]
45° line connecting the most inferior part of the subiculum medially to the cistern (head and body) [Pr]
Oblique line with same inclination of parahippocampal WM, connecting the inferior part of the subiculum to the quadrigeminal cistern [K,L,M¥]
Orizontal line from the highest medial point of the parahippocampal WM to the cistern [B,H,J¥]
Line outlining the contour of white matter of parahippocampal gyrus [Pa,S]
MODELING & COMPUTATIONS
Modeling by Simon Duchesne and Nicolas Robitaille
Université Laval and Centre de Recherche Université Laval – Robert Giffard
Quebec City, Canada
MODELING & COMPUTATIONS
J Pr M Pa H
B C K L S
MODELING & COMPUTATIONS
DISCUSSION
Features operationalization: 4 tracing units, and subunits
Preliminary info on contribution of units to total hippo volume
3D models may help Delphi panel for developing harmonized protocol
Available: draft paper, and online materialhttp://www.hippocampal-protocol.net
April 14: Poster 24 PO3: Ageing and dementia imaging - other
Lilly International
Wyeth International
ACKNOWLEDGEMENTS