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Article ; Online: Swept coded aperture real-time femtophotography.

Liu, Jingdan / Marquez, Miguel / Lai, Yingming / Ibrahim, Heide / Légaré, Katherine / Lassonde, Philippe / Liu, Xianglei / Hehn, Michel / Mangin, Stéphane / Malinowski, Grégory / Li, Zhengyan / Légaré, François / Liang, Jinyang

Nature communications

2024 Volume 15, Issue 1, Page(s) 1589

Abstract: Single-shot real-time femtophotography is indispensable for imaging ultrafast dynamics during their times of occurrence. Despite their advantages over conventional multi-shot approaches, existing techniques confront restricted imaging speed or degraded ... ...

Abstract	Single-shot real-time femtophotography is indispensable for imaging ultrafast dynamics during their times of occurrence. Despite their advantages over conventional multi-shot approaches, existing techniques confront restricted imaging speed or degraded data quality by the deployed optoelectronic devices and face challenges in the application scope and acquisition accuracy. They are also hindered by the limitations in the acquirable information imposed by the sensing models. Here, we overcome these challenges by developing swept coded aperture real-time femtophotography (SCARF). This computational imaging modality enables all-optical ultrafast sweeping of a static coded aperture during the recording of an ultrafast event, bringing full-sequence encoding of up to 156.3 THz to every pixel on a CCD camera. We demonstrate SCARF's single-shot ultrafast imaging ability at tunable frame rates and spatial scales in both reflection and transmission modes. Using SCARF, we image ultrafast absorption in a semiconductor and ultrafast demagnetization of a metal alloy.
Language	English
Publishing date	2024-02-21
Publishing country	England
Document type	Journal Article
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-024-45820-z
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Article: Telehealth-Delivered Program and Accompanying Patients to Enhance the Clinical Condition of Patients Throughout a Liver Transplant: Protocol for a Mixed Methods Study.

Pomey, Marie-Pascale / Le Roux, Enora / Nadon, Nathalie / Perron, Jessie / Barry, Angèle / Bémeur, Chantal / Poder, Thomas G / Duford, Fernand / Laviolette, Louise / Tétrault-Lassonde, Johanne / Vialaron, Cécile / Escalona, Manuel J / Normandin, Louise / Huard, Geneviève / Girardin, Catherine / Rose, Christopher / Malas, Kathy / Ouellet, Denis / Vincent, Catherine

JMIR research protocols

2024 Volume 13, Page(s) e54440

Abstract: Background: Liver transplantation (LT) is indicated in patients with severe acute or chronic liver failure for which no other therapy is available. With the increasing number of LTs in recent years, liver centers worldwide must manage their patients ... ...

Abstract	Background: Liver transplantation (LT) is indicated in patients with severe acute or chronic liver failure for which no other therapy is available. With the increasing number of LTs in recent years, liver centers worldwide must manage their patients according to their clinical situation and the expected waiting time for transplantation. The LT clinic at the Centre hospitalier de l'Université de Montréal (CHUM) is developing a new health care model across the entire continuum of pre-, peri-, and posttransplant care that features patient monitoring by an interdisciplinary team, including an accompanying patient; a digital platform to host a clinical plan; a learning program; and data collection from connected objects. Objective: This study aims to (1) evaluate the outcomes following the implementation of a patient platform with connected devices and an accompanying patient, (2) identify implementation barriers and facilitators, (3) describe service outcomes in terms of health outcomes and the rates and nature of contact with the accompanying patient, (4) describe patient outcomes, and (5) assess the intervention's cost-effectiveness. Methods: Six types of participants will be included in the study: (1) patients who received transplants and reached 1 year after transplantation before September 2023 (historical cohort or control group), (2) patients who will receive an LT between December 2023 and November 2024 (prospective cohort/intervention group), (3) relatives of those patients, (4) accompanying patients who have received an LT and are interested in supporting patients who will receive an LT, (5) health care professionals, and (6) decision makers. To describe the study sample and collect data to achieve all the objectives, a series of validated questionnaires, accompanying patient logbooks, transcripts of interviews and focus groups, and clinical indicators will be collected throughout the study. Results: In total, 5 (steering, education, clinical-technological, nurse prescription, and accompanying patient) working committees have been established for the study. Recruitment of patients is expected to start in November 2023. All questionnaires and technological platforms have been prepared, and the clinicians, stakeholders, and accompanying patient personnel have been recruited. Conclusions: The implementation of this model in the trajectory of LT recipients at the CHUM may allow for better monitoring and health of patients undergoing transplantation, ultimately reducing the average length of hospital stay and promoting better use of medical resources. In the event of positive results, this model could be transposed to all transplant units at the CHUM and across Quebec (potentially affecting 888 patients per year) but could also be applied more widely to the monitoring of patients with other chronic diseases. The lessons learned from this project will be shared with decision makers and will serve as a model for other initiatives involving accompanying patients, connected objects, or digital platforms. International registered report identifier (irrid): PRR1-10.2196/54440.
Language	English
Publishing date	2024-03-22
Publishing country	Canada
Document type	Journal Article
ZDB-ID	2719222-2
ISSN	1929-0748
ISSN	1929-0748
DOI	10.2196/54440
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Article ; Online: Laser wakefield acceleration based x ray source using 225-TW and 13-fs laser pulses produced by thin film compression.

Fourmaux, S / Lassonde, P / Mironov, S Yu / Hallin, E / Légaré, F / Maclean, S / Khazanov, E A / Mourou, G / Kieffer, J C

Optics letters

2022 Volume 47, Issue 13, Page(s) 3163–3166

Abstract: ... laser pulses (3.2 J, 24 fs) are efficiently compressed down to 13 fs with the thin film compression (TFC ...

Abstract	We show that 13-fs laser pulses associated with 225 TW of peak power can be used to produce laser wakefield acceleration (LWFA) and generate synchrotron radiation. To achieve this, 130-TW high-power laser pulses (3.2 J, 24 fs) are efficiently compressed down to 13 fs with the thin film compression (TFC) technique using large chirped mirrors after propagation and spectral broadening through a 1-mm-thick fused silica plate. We show that the compressed 13-fs laser pulse can be properly focused even if it induces a 10% degradation of the Strehl ratio. We demonstrate the usability of such a laser beam. We observe both an increase of the electron energy and of the betatron radiation critical energy when the pulse duration is reduced to 13 fs compared with the 24-fs case.
Language	English
Publishing date	2022-07-01
Publishing country	United States
Document type	Journal Article
ISSN	1539-4794
ISSN (online)	1539-4794
DOI	10.1364/OL.459199
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Article ; Online: Information transfer via temporal convolution in nonlinear optics.

Lassonde, Philippe / Ibrahim, Heide / Leblanc, Adrien / Azaña, José / Schmidt, Bruno E / Légaré, François

Scientific reports

2020 Volume 10, Issue 1, Page(s) 14969

Abstract: Nonlinear parametric processes involving ultrashort pulses are typically carried out in time domain, which mathematically corresponds to a convolution of their frequency spectra. In contrast, this spectral convolution changes into a multiplication ... ...

Abstract	Nonlinear parametric processes involving ultrashort pulses are typically carried out in time domain, which mathematically corresponds to a convolution of their frequency spectra. In contrast, this spectral convolution changes into a multiplication operation when performing the nonlinear interaction in frequency domain. Here, we extend the scope of frequency-domain nonlinear optics by demonstrating its ability to perform a temporal convolution. Through this approach, nonlinear optical operations that are inaccessible in time domain can be realised: specific optical information can be coherently advanced by picoseconds within a pulse sequence-a newly generated second harmonic pulse carries the amplitude and phase information of two input pulses. This central pulse is isolated when using an input field consisting of two cross-polarized input pulses in combination with type-II second harmonic generation. The effects of nonlinear temporal convolution can be viewed from the aspect of signal processing and pulse shaping, where the nonlinear interaction in the parametric crystal plays the role of a dynamic linear optical filter-in contrast to conventional static filters-with a shaping mask instantaneously adapting to the laser field.
Language	English
Publishing date	2020-09-11
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-020-72170-9
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Article ; Online: Source credibility and the processing of refutation texts.

Van Boekel, Martin / Lassonde, Karla A / O'Brien, Edward J / Kendeou, Panayiota

Memory & cognition

2017 Volume 45, Issue 1, Page(s) 168–181

Abstract: The knowledge revision components framework (KReC) outlines the basic comprehension processes and text factors that can be accentuated to increase the potential for knowledge revision during reading. The goal of the present study was to explore source ... ...

Abstract	The knowledge revision components framework (KReC) outlines the basic comprehension processes and text factors that can be accentuated to increase the potential for knowledge revision during reading. The goal of the present study was to explore source credibility as one such text factor. In Experiment 1, we established the utility of a set of refutation texts in influencing knowledge revision. Participants read ten refutation and ten control texts. The participants had faster reading times and higher posttest scores for the refutation than for the control texts, providing evidence for knowledge revision. In Experiment 2, we examined the influence of source credibility under normal reading conditions. Participants read 20 refutation texts, ten with high-credibility and ten with low-credibility sources. The reading times and posttest scores suggested that knowledge revision unfolded successfully, independent of credibility. Using the same texts, in Experiment 3 we examined the influence of direct instructions that made the credibility of the source of information more salient. When the credibility of the source was made salient, the revision process was disrupted in the low-credibility condition, as evidenced by slower reading times and lower posttest scores than in the high-credibility condition. The results add to our understanding of the factors that constrain knowledge revision during the reading of refutation texts, and are discussed in the context of the extant literature and KReC.
MeSH term(s)	Adult ; Comprehension/physiology ; Humans ; Knowledge ; Reading ; Thinking/physiology ; Young Adult
Language	English
Publishing date	2017-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	185691-1
ISSN	1532-5946 ; 0090-502X
ISSN (online)	1532-5946
ISSN	0090-502X
DOI	10.3758/s13421-016-0649-0
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Article ; Online: Olfaction in athletes with concussion.

Charland-Verville, Vanessa / Lassonde, Maryse / Frasnelli, Johannes

American journal of rhinology & allergy

2012 Volume 26, Issue 3, Page(s) 222–226

Abstract: Background: Moderate to severe traumatic brain injuries (TBIs) commonly lead to olfactory dysfunction; it is, however, unclear whether and to what degree mild TBI such as concussions, which are common sports injuries, affect olfactory function. We ... ...

Abstract	Background: Moderate to severe traumatic brain injuries (TBIs) commonly lead to olfactory dysfunction; it is, however, unclear whether and to what degree mild TBI such as concussions, which are common sports injuries, affect olfactory function. We therefore aimed to evaluate smell function in athletes who sustained one or more sport concussions in a cross-sectional design. Methods: Twenty-two University-level football players with one or multiple concussions and 13 control athletes without a history of concussion participated. We measured olfactory function by using the Sniffin' Sticks test to assess subjects' ability to discriminate and identify odors as well as their detection thresholds. In addition, we assessed odor intensity and pleasantness. Results: We used number of concussions and time since the last concussion as independent variables and measure of olfactory function as dependent variables. Although we did not observe any significant effect of the number of concussions, athletes with a longer delay from time of concussion scored significantly weaker than more recently concussed subjects on the odor identification test and on an aggregate olfactory score. Accordingly, we observed a significant negative linear correlation between the odor identification score and the time elapsed since the last concussion. Conclusion: These findings suggest a possible degenerative effect of concussions on olfactory function.
MeSH term(s)	Adult ; Brain Concussion/complications ; Brain Concussion/physiopathology ; Cross-Sectional Studies ; Football/injuries ; Football/statistics & numerical data ; Humans ; Male ; Olfaction Disorders/diagnosis ; Olfaction Disorders/etiology ; Risk Factors ; Sensory Thresholds ; Smell ; Time Factors ; Young Adult
Language	English
Publishing date	2012-05
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2482804-X
ISSN	1945-8932 ; 1945-8924
ISSN (online)	1945-8932
ISSN	1945-8924
DOI	10.2500/ajra.2012.26.3769
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Article ; Online: High energy redshifted and enhanced spectral broadening by molecular alignment.

Fan, G / Safaei, R / Kwon, O / Schuster, V / Légaré, K / Lassonde, P / Ehteshami, A / Arias, L / Laramée, A / Beaudoin-Bertrand, J / Limpert, J / Tao, Z / Spanner, M / Schmidt, B E / Ibrahim, H / Baltuška, A / Légaré, F

Optics letters

2020 Volume 45, Issue 11, Page(s) 3013–3016

Abstract: We demonstrate an efficient approach for enhancing the spectral broadening of long laser pulses and for efficient frequency redshifting by exploiting the intrinsic temporal properties of molecular alignment inside a gas-filled hollow-core fiber (HCF). We ...

Abstract	We demonstrate an efficient approach for enhancing the spectral broadening of long laser pulses and for efficient frequency redshifting by exploiting the intrinsic temporal properties of molecular alignment inside a gas-filled hollow-core fiber (HCF). We find that laser-induced alignment with durations comparable to the characteristic rotational time scale
Language	English
Publishing date	2020-06-01
Publishing country	United States
Document type	Journal Article
ISSN	1539-4794
ISSN (online)	1539-4794
DOI	10.1364/OL.387037
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Article: Wound complications after in situ bypass.

Lassonde, J

Journal of vascular surgery

1989 Volume 9, Issue 4, Page(s) 620–621

MeSH term(s)	Femoral Vein/surgery ; Humans ; Postoperative Complications/etiology ; Saphenous Vein/surgery
Language	English
Publishing date	1989-04
Publishing country	United States
Document type	Letter
ZDB-ID	605700-7
ISSN	1097-6809 ; 0741-5214
ISSN (online)	1097-6809
ISSN	0741-5214
DOI	10.1016/0741-5214(89)90485-0
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Article ; Online: Phase-matching-free pulse retrieval based on transient absorption in solids.

Leblanc, A / Lassonde, P / Petit, S / Delagnes, J-C / Haddad, E / Ernotte, G / Bionta, M R / Gruson, V / Schmidt, B E / Ibrahim, H / Cormier, E / Légaré, F

Optics express

2019 Volume 27, Issue 20, Page(s) 28998–29015

Abstract: In this paper, we introduce a pulse characterization technique that is free of phase-matching constraints, exploiting transient absorption in solids as an ultrafast optical switch. Based on a pump-probe setup, this technique uses pump pulses of ... ...

Abstract	In this paper, we introduce a pulse characterization technique that is free of phase-matching constraints, exploiting transient absorption in solids as an ultrafast optical switch. Based on a pump-probe setup, this technique uses pump pulses of sufficient intensity to induce the switch, while the pulses to characterize are probing the transmissivity drop of the photoexcited material. This enables the characterization of low-intensity ultra-broadband pulses at the detection limit of the spectrometer and within the transparency range of the solid. For example, by using zinc selenide (ZnSe), pulses with wavelengths from 0.5 to 20
Language	English
Publishing date	2019-11-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	1491859-6
ISSN	1094-4087 ; 1094-4087
ISSN (online)	1094-4087
ISSN	1094-4087
DOI	10.1364/OE.27.028998
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Article ; Online: Perceptual priming does not transfer interhemispherically in the acallosal brain.

Forget, J / Lippé, Sarah / Lassonde, Maryse

Experimental brain research

2009 Volume 192, Issue 3, Page(s) 443–454

Abstract: Acallosal participants usually do not display any disconnection signs in tasks requiring an explicit or declarative type of response. They can accurately compare stimuli placed in each hand and they perform normally on lateralized recognition tasks. They, ...

Abstract	Acallosal participants usually do not display any disconnection signs in tasks requiring an explicit or declarative type of response. They can accurately compare stimuli placed in each hand and they perform normally on lateralized recognition tasks. They, however, show impairment in tasks assessing interdependent motor control, bilateral coordination and they are also unable to intermanually transfer an implicit procedural motor skill. These deficits suggest that compensation might be limited when a motor component is involved. Alternately, it is also possible that interhemispheric transmission in callosal agenesis might be limited when implicit or unconscious processes are involved (Berlucchi et al. in Neuropsychologia 33:923-936, 1995; De Guise et al. in Brain 122:1049-1062, 1999). The aim of the present study was to assess interhemispheric transfer in two distinct nondeclarative tasks, namely visuoperceptual skill learning and perceptual priming, with a lateralized version of the fragmented picture task developed by Snodgrass et al. (Behav Res Methods Inst Comp 19:270-274, 1987) that did not involve any motor component. The performance of five acallosal and one early-callosotomized individuals was compared to that of control participants divided into four groups (n = 10) according to which hemisphere was trained (left or right) and which response mode was used (manual or verbal). Visuoperceptual skill learning was observed in all control groups except for the group submitted to training of the left hemisphere in the manual modality of response. The acallosal and early-callosotomized participants did not show any implicit learning of the visuoperceptual skill on any of the conditions. The evaluation of the perceptual priming effect in the second part of the testing revealed that the priming effect was restricted to the trained hemisphere in participants without corpus callosum, as opposed to all neurogically intact participants who presented interhemispheric transfer of the priming effect. These findings indicate that the compensatory pathways, most probably subcortical commissures, are insufficient to allow interhemispheric transfer of perceptual priming, confirming the limits of neural plasticity in the absence of the corpus callosum. They also support the dissociation between declarative and nondeclarative memory in the split-brain and acallosal participants suggested by Berlucchi et al. (1995) and observed by De Guise et al. (Brain 122:1049-1062, 1999). These results are further discussed within the context of neurobiological theories of memory systems.
MeSH term(s)	Acrocallosal Syndrome/complications ; Acrocallosal Syndrome/physiopathology ; Adult ; Agenesis of Corpus Callosum ; Cerebral Cortex/anatomy & histology ; Cerebral Cortex/physiology ; Cognition Disorders/etiology ; Cognition Disorders/physiopathology ; Conditioning (Psychology)/physiology ; Corpus Callosum/surgery ; Disability Evaluation ; Female ; Functional Laterality/physiology ; Humans ; Learning Disorders/etiology ; Learning Disorders/physiopathology ; Male ; Memory/physiology ; Neuronal Plasticity/physiology ; Neuropsychological Tests ; Perceptual Disorders/etiology ; Perceptual Disorders/physiopathology ; Photic Stimulation ; Visual Perception/physiology ; Young Adult
Language	English
Publishing date	2009-01
Publishing country	Germany
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1201-4
ISSN	1432-1106 ; 0014-4819
ISSN (online)	1432-1106
ISSN	0014-4819
DOI	10.1007/s00221-008-1602-7
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