Dynamic single-slice CT estimates whole-lung dual-energy CT variables in pigs with and without experimental lung injury [Elektronisk resurs]
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Cronin, John N (författare)
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Borges, João Batista (författare)
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Crockett, Douglas C (författare)
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Farmery, Andrew D (författare)
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Hedenstierna, Göran, 1941- (författare)
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Larsson, Anders (författare)
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Tran, Minh C (författare)
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Camporota, Luigi (författare)
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Formenti, Federico (författare)
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Uppsala universitet Medicinska och farmaceutiska vetenskapsområdet (utgivare)
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Uppsala universitet Medicinska och farmaceutiska vetenskapsområdet (utgivare)
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Uppsala universitet Medicinska och farmaceutiska vetenskapsområdet (utgivare)
- Publicerad: Springer, 2019
- Engelska.
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Ingår i: Intensive Care Medicine Experimental. - 1646-2335. ; 7:1
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Sammanfattning
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- BACKGROUND: Dynamic single-slice CT (dCT) is increasingly used to examine the intra-tidal, physiological variation in aeration and lung density in experimental lung injury. The ability of dCT to predict whole-lung values is unclear, especially for dual-energy CT (DECT) variables. Additionally, the effect of inspiration-related lung movement on CT variables has not yet been quantified. METHODS: Eight domestic pigs were studied under general anaesthesia, including four following saline-lavage surfactant depletion (lung injury model). DECT, dCT and whole-lung images were collected at 12 ventilatory settings. Whole-lung single energy scans images were collected during expiratory and inspiratory apnoeas at positive end-expiratory pressures from 0 to 20 cmH 2 O. Means and distributions of CT variables were calculated for both dCT and whole-lung images. The cranio-caudal displacement of the anatomical slice was measured from whole-lung images. RESULTS: Mean CT density and volume fractions of soft tissue, gas, iodinated blood, atelectasis, poor aeration, normal aeration and overdistension correlated between dCT and the whole lung (r 2 0.75-0.94) with agreement between CT density distributions (r 0.89-0.97). Inspiration increased the matching between dCT and whole-lung values and was associated with a movement of 32% (SD 15%) of the imaged slice out of the scanner field-of-view. This effect introduced an artefactual increase in dCT mean CT density during inspiration, opposite to that caused by the underlying physiology. CONCLUSIONS: Overall, dCT closely approximates whole-lung aeration and density. This approximation is improved by inspiration where a decrease in CT density and atelectasis can be interpreted as physiological rather than artefactual.
Ämnesord
- Medical and Health Sciences (hsv)
- Clinical Medicine (hsv)
- Anesthesiology and Intensive Care (hsv)
- Medicin och hälsovetenskap (hsv)
- Klinisk medicin (hsv)
- Anestesi och intensivvård (hsv)
- Medical and Health Sciences (hsv)
- Clinical Medicine (hsv)
- Radiology, Nuclear Medicine and Medical Imaging (hsv)
- Medicin och hälsovetenskap (hsv)
- Klinisk medicin (hsv)
- Radiologi och bildbehandling (hsv)
- Fysiologi (uu)
- Physiology (uu)
Genre
- government publication (marcgt)
Indexterm och SAB-rubrik
- Acute lung injury
- Artificial
- Contrast media
- Respiration
- Swine
- Tomography
- X-ray computed
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