1. A door for a door thrust reverser capable of being mounted so as to pivot on a fixed structure of a thrust reverser, comprising:
an internal surface designed to be incorporated into a flow duct for an air flow generated by a turbojet;
an external surface designed to ensure the external aerodynamic continuity of a nacelle designed to be fitted with said thrust reverser; and
air-flow deflection means placed on an upstream end of the door and mounted movably in a plane substantially perpendicular to a plane of the door between a first retracted position in which the deflection means do not enter the duct when the door is in a closed position and a second deployed position in which the deflection means protrude from the door;
wherein the deflection means are mounted rotatably in said plane about a corresponding shaft.
2. The door as claimed in claim 1, wherein the deflection means are mounted so that the means can move against elastic return means tending to return the means to the deployed position.
3. The door as claimed in claim 1, wherein the deflection means comprise at least two flaps mounted on either side of a midline of the door.
4. The door as claimed in claim 3, wherein a pivot shaft of at least one flap is situated close to a lateral end of the door.
5. The door as claimed in claim 4, wherein the pivot shaft of at least one flap is situated in a vicinity of the midline of the door.
6. A door thrust reverser, comprising:
at least one door as claimed in claim 1; and
a fixed structure on which said door is mounted so as to pivot between a first closed position, in which said door closes the reverser and forms a portion of an external cowl, the deflection means of the flow being in a retracted position, and a second open position, in which said door exposes a passageway in the fixed structure and is capable of at least partially blocking an air flow generated by a turbojet, the deflection means being in the deployed position.
7. The thrust reverser as claimed in claim 6, wherein the fixed structure is fitted with abutment means capable of allowing a return of the deflection means to their retracted position when the door pivots to the closed position.
8. A nacelle for a turbojet, comprising a thrust-reverser system as claimed in claim 6.
9. A nacelle for a turbojet, comprising a thrust-reverser system as claimed in claim 7.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Method for reconstructing a fluorescence image of the interior of a turbid medium, the method comprising the steps:
accommodating a turbid medium (1) to which a fluorescent contrast agent has been administered in a measurement volume (4), the fluorescent contrast agent being capable of emitting light in a first range of wavelengths upon irradiation with light;
performing attenuation measurements at a plurality of different wavelengths (i, . . . , k) by subsequently irradiating the turbid medium (1) with light from a plurality of different source positions and detecting light emanating from the turbid medium (1) in a plurality of detection positions for each source position;
reconstructing absorption properties (\u03bca(r, )) as a function of the position in the interior of the turbid medium (1) for the plurality of different wavelengths from the attenuation measurements;
calculating absorption properties as a function of the position in the interior of the turbid medium (1) for the wavelengths of the first range of wavelengths;
performing a fluorescence measurement by subsequently irradiating the turbid medium (1) with light causing the fluorescent contrast agent to emit light in the first range of wavelengths from the plurality of source positions and detecting the light emanating from the fluorescent contrast agent in the plurality of detection positions for each source position;
reconstructing a fluorescence image of the spatial distribution of the fluorescent contrast agent in the interior of the turbid medium (1) from the fluorescence measurement using the calculated absorption properties.
2. The method according to claim 1, wherein, in the step of reconstructing absorption properties, absorption coefficients (\u03bca(r, )) are calculated.
3. The method according to claim 2, wherein the absorption coefficients (\u03bca(r, )) are calculated by considering the turbid medium (1) as a linear combination of a plurality of substances (i) and determining the local concentrations (ci) of the plurality of substances from the attenuation measurements at the plurality of different wavelengths (1, . . . , k).
4. The method according to claim 3, wherein the absorption properties (\u03bca(r, )) for wavelengths of the first range of wavelengths are calculated using a known spectral behavior of the plurality of substances (i).
5. The method according to claim 3, wherein the plurality of substances (i) comprises the fluorescent contrast agent.
6. The method according to claim 5, wherein the reconstructed fluorescence image is fed back as an input to the step of reconstructing absorption properties (\u03bca(r, )) as a function of the position in the interior of the turbid medium, and the steps of calculating the absorption properties and reconstructing a fluorescence image are iteratively repeated.
7. Device for imaging an interior of a turbid medium; the device comprising:
a measurement volume (4) adapted for accommodating a turbid medium (1) to which a fluorescent contrast agent has been administered which is capable of emitting light in a first range of wavelengths upon irradiation;
a light source unit (6) adapted to subsequently irradiate the measurement volume (4) with light from a plurality of different source positions; the light source unit being capable of selectively emitting light of a plurality of different wavelengths (z, . . . , k);
a detection unit (7) adapted to detect light emanating from the measurement volume (4) in a plurality of different detection positions; and
a control and reconstruction unit (8) adapted to control the device to perform attenuation measurements at a plurality of different wavelengths by subsequently irradiating the measurement volume (4) with light from a plurality of different source positions and detect light emanating from the measurement volume (4) in a plurality of detection positions for each source position;
perform a fluorescence measurement by subsequently irradiating the measurement volume (4) with light causing the fluorescent contrast agent to emit light in the first range of wavelengths from the plurality of source positions and detecting the light emanating from the fluorescent contrast agent in the plurality of detection positions for each source position;
reconstruct absorption properties (\u03bca(r, )) as a function of the position in the measurement volume (4) for the plurality of different wavelengths from the attenuation measurements;
calculate absorption properties as a function of the position in the measurement volume (4) for wavelengths of the first range of wavelengths;
reconstruct a fluorescence image of the spatial distribution of the fluorescent contrast agent in the measurement volume (4) from the fluorescence measurement using the calculated absorption properties.
8. The device according to claim 7, wherein a filter is provided in the device introducible in the light path between the measurement volume (4) and the detection unit (7) for the fluorescence measurement.
9. The device according to claim 7, wherein the device is a medical image acquisition device.