Microscopic and Macroscopic Identification of Infernal Breakdown in Pears with NMR Relaxometry and On-Line MRI
N. Hernandes, B. Hills, N. Marigheto and P. Barreiro
Book of Abstract. Information & technology for sustainable fruit & vegetable production, The 7th Fruit, Nut and Vegetable Production Engineering Symposium, 12-16 September 2005, Monpellier, France. Page 100
2005
บทคัดย่อ
Microscopic and Macroscopic Identification of Infernal Breakdown in Pears with NMR Relaxometry and On-Line MRI
Internal browning in pears (Pyruscommunis L.cv. Blanquilla)has been studied by NMR using CPMG sequences with variable 90-180° pulse spacing (), T2maps and T1-T2 correlation spectroscopy. Spectrometers operating at 100.73, 200 MHz and 300.15 MHz were used. Affected tissue shows higher transverse relaxation rate compared to healthy tissue especially at higher magnetic fieldstrength and long . Tissue disintegration as well as water evaporation appear to be the main causes of this response. FLASH T2*-weighted images and FLASH PD-weighted images acquired for pears conveyed at 50 mm/s are discriminated for internal breakdown according to histogram features. A percentage of 94% and 96% corrected classification rate is found for the former and the later type of images respectively.