1
|
Brandao MP, Iwakura R, Honorato-Sobrinho AA, Haleplian K, Ito AS, de Freitas LCC, Bachmann L. Optical Characterization of Parathyroid Tissues. Appl Spectrosc 2016; 70:1709-1716. [PMID: 27381351 DOI: 10.1177/0003702816641120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 01/17/2016] [Indexed: 06/06/2023]
Abstract
The parathyroid glands are small and often similar to lymph nodes, fat, and thyroid tissue. These glands are difficult to identify during surgery and a biopsy of the parathyroid for identification can lead to damage of the gland. The use of static and time-resolved fluorescence techniques to detect biochemical composition and tissue structure alterations could help to develop a portable, minimally invasive, and nondestructive method to assist medical evaluation of parathyroid tissues. In this study, we investigated 10 human parathyroid samples by absorbance, fluorescence, excitation, and time-resolved fluorescence measurements. Moreover, we compared the results of time-resolved fluorescence measurements with 59 samples of thyroid tissues. The fluorescence lifetimes with emission at 340 nm were 1.09 ± 0.10 and 4.46 ± 0.06 ns for healthy tissue, 1.01 ± 0.25 and 4.39 ± 0.36 ns for benign lesions, and 0.67 ± 0.36 and 3.92 ± 0.72 ns for malignant lesions. The lifetimes for benign and malignant lesions were significantly different, as attested by the analysis of variance with confidence levels higher than 87%. For each class of samples (healthy, benign, and malignant) we perceived statistical differences between the thyroid and parathyroid tissue, independently. After further investigations, fluorescence methods could become a tool to identify normal and pathological parathyroid tissues and distinguish thyroid from parathyroid tissues.
Collapse
Affiliation(s)
- M P Brandao
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Departamento de Física, São Paulo, Brazil
| | - R Iwakura
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Departamento de Oftalmo, Otorrino e Cirurgia de Cabeça e Pescoço, São Paulo, Brazil
| | - A A Honorato-Sobrinho
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Departamento de Oftalmo, Otorrino e Cirurgia de Cabeça e Pescoço, São Paulo, Brazil
| | - K Haleplian
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Departamento de Física, São Paulo, Brazil
| | - A S Ito
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Departamento de Oftalmo, Otorrino e Cirurgia de Cabeça e Pescoço, São Paulo, Brazil
| | - L C Conti de Freitas
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Departamento de Oftalmo, Otorrino e Cirurgia de Cabeça e Pescoço, São Paulo, Brazil
| | - L Bachmann
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Departamento de Física, São Paulo, Brazil
| |
Collapse
|
2
|
Brandao M, Iwakura R, Basilio F, Haleplian K, Ito A, de Freitas LCC, Bachmann L. Fluorescence lifetime of normal, benign, and malignant thyroid tissues. J Biomed Opt 2015; 20:067003. [PMID: 26085181 DOI: 10.1117/1.jbo.20.6.067003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 05/19/2015] [Indexed: 05/20/2023]
Abstract
Fine-needle aspiration cytology is the standard technique to diagnose thyroid pathologies. However, this method results in a high percentage of inconclusive and false negatives. The use of time-resolved fluorescence techniques to detect biochemical composition and tissue structure alterations could help to develop a portable, minimally invasive, and nondestructive method to assist during surgical procedures. This study aimed to use fluorescence lifetimes to differentiate healthy and benign tissues from malignant thyroid tissue. The thyroid tissue was excited at 298-300 nm and the fluorescence decay registered at 340 and 450 nm. We observed fluorescence lifetimes at 340 nm emission of 0.80 ± 0.26 and 3.94 ± 0.47 ns for healthy tissue; 0.90 ± 0.24 and 4.05 ± 0.46 ns for benign lesions; and 1.21 ± 0.14 and 4.63 ± 0.25 ns for malignant lesions. For 450 nm emissions, we obtain lifetimes of 0.25 ± 0.18 and 3.99 ± 0.39 ns and for healthy tissue, 0.24 ± 0.17 and 4.20 ± 0.48 ns for benign lesions, 0.33 ± 0.32 and 4.55 ± 0.55 ns for malignant lesions. Employing analysis of variance, we differentiate malignant lesions from benign and healthy tissues. In addition, we use quadratic discriminant analysis to distinguish malignant from benign and healthy tissues with an accuracy of 76.1%, sensitivity of 74.7%, and specificity of 83.3%. These results indicate that time-resolved fluorescence can assist medical evaluation of thyroid pathologies during surgeries.
Collapse
Affiliation(s)
- Mariana Brandao
- Universidade de São Paulo, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Departamento de Física. Avenue Bandeirantes 3900, Ribeirão Preto, São Paulo 14040-901, Brazil
| | - Ricardo Iwakura
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Oftalmo, Otorrino e Cirurgia de Cabeça e Pescoço, Avenue Bandeirantes 3900, Ribeirão Preto, São Paulo 14040-901, Brazil
| | - Fagne Basilio
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Oftalmo, Otorrino e Cirurgia de Cabeça e Pescoço, Avenue Bandeirantes 3900, Ribeirão Preto, São Paulo 14040-901, Brazil
| | - Kaique Haleplian
- Universidade de São Paulo, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Departamento de Física. Avenue Bandeirantes 3900, Ribeirão Preto, São Paulo 14040-901, Brazil
| | - Amando Ito
- Universidade de São Paulo, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Departamento de Física. Avenue Bandeirantes 3900, Ribeirão Preto, São Paulo 14040-901, Brazil
| | - Luiz Carlos Conti de Freitas
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Oftalmo, Otorrino e Cirurgia de Cabeça e Pescoço, Avenue Bandeirantes 3900, Ribeirão Preto, São Paulo 14040-901, Brazil
| | - Luciano Bachmann
- Universidade de São Paulo, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Departamento de Física. Avenue Bandeirantes 3900, Ribeirão Preto, São Paulo 14040-901, Brazil
| |
Collapse
|