Comparación de la calidad científica de los radiólogos españoles que publican en revistas radiológicas españolas e internacionales / Comparison of the Scientific Quality of Spanish Radiologists That Publish in International Radiology Journals and in Spanish Radiology Journals

Objetivo. Analizar si los autores españoles que publican en revistas radiológicas internacionales con factor de impacto (AJR, European Radiology, Investigative Radiology, Radiographics y Radiology) tienen una calidad científica mayor, medida por el índice h de Hirsch, que los que publican solo en revistas nacionales o en ambas categorías. Material y métodos. Se han analizado para este trabajo seis revistas radiológicas, cinco internacionales y una nacional (Radiología), seleccionando a los autores españoles que estuvieran trabajando en un centro español en el momento de la autoría y hubieran publicado sus artículos originales en 2008 y 2009. Los autores se agruparon en tres clases: a) los que han publicado solo en revistas internacionales; b) los que lo han hecho solo en Radiología, y c) los que han publicado en ambas categorías. Se calculó el índice h de cada autor analizándose los grupos mediante la prueba estadística de la normalidad (Kolmogorov-Smirnov), la prueba no paramétrica de Kruskal-Wallis y la prueba de la mediana para evaluar las diferencias. Resultados. De los 440 autores españoles identificados en el bienio, 248 (56%) publicaron solo en Radiología, 172 (39%) solo en revistas internacionales y 20 (5%) en ambas. La media del índice h fue menor para el grupo «solo Radiología» (media±desviación estándar, 1,15±2,35) que para el de «solo internacionales» (2,59±3,39). El mayor índice h se alcanzó en el grupo «Radiología e internacionales» (4,1±3,89), con diferencia estadísticamente muy significativa (p<0,0001). Conclusiones. Los autores españoles de mayor prestigio y calidad publican tanto en revistas internacionales como en Radiología (AU)

Objective. To determine that the quality, measured by the Hirsch index, of Spanish authors who publish in international radiology journals with an impact factor (AJR, European Radiology, Investigative Radiology, Radiographics, and Radiology) is higher of those who publish only in Spanish journals or in both types of journals. Material and methods. We analyzed a total of 6 radiology journals, including 5 international journals and one national (Radiología). We selected Spanish authors of original articles published in 2008 and 2009 who were working at Spanish centers when their articles were written. We classified the authors into three categories: a) those who published only in international journals; b) those who published only in Radiología, and c) those who published in Radiología and in an international journal. We calculated the Hirsch index score for each author and analyzed the groups using the Kolmogorov-Smirnov goodness-of-fit test, the Kruskal-Wallis nonparametric test, and the median test to evaluate the differences. Results. Of the 440 identified Spanish authors as having published in the two-year period, 248 (56%) published only in Radiología, 172 (39%) only in international journals, and 20 (5%) in both. The mean Hirsch index score for the group of authors who published only in Radiología (1.15±2.35) was lower than for those who published only in international journals (2.59±3.39). Authors who published in both international journals and Radiología had the highest score on the Hirsch index (4.1±3.89) (P<.001). Conclusions. The Spanish authors with the highest prestige and quality publish both in international journals and in Radiología (AU)

[Comparison of the scientific quality of spanish radiologists that publish in international radiology journals and in spanish radiology journals]. / Comparación de la calidad científica de los radiólogos españoles que publican en revistas radiológicas españolas e internacionales.

OBJECTIVE: To determine that the quality, measured by the Hirsch index, of Spanish authors who publish in international radiology journals with an impact factor (AJR, European Radiology, Investigative Radiology, Radiographics, and Radiology) is higher of those who publish only in Spanish journals or in both types of journals. MATERIAL AND METHODS: We analyzed a total of 6 radiology journals, including 5 international journals and one national (Radiología). We selected Spanish authors of original articles published in 2008 and 2009 who were working at Spanish centers when their articles were written. We classified the authors into three categories: a) those who published only in international journals; b) those who published only in Radiología, and c) those who published in Radiología and in an international journal. We calculated the Hirsch index score for each author and analyzed the groups using the Kolmogorov-Smirnov goodness-of-fit test, the Kruskal-Wallis nonparametric test, and the median test to evaluate the differences. RESULTS: Of the 440 identified Spanish authors as having published in the two-year period, 248 (56%) published only in Radiología, 172 (39%) only in international journals, and 20 (5%) in both. The mean Hirsch index score for the group of authors who published only in Radiología (1.15±2.35) was lower than for those who published only in international journals (2.59±3.39). Authors who published in both international journals and Radiología had the highest score on the Hirsch index (4.1±3.89) (P<.001). CONCLUSIONS: The Spanish authors with the highest prestige and quality publish both in international journals and in Radiología.

Complementariedad de la espectroscopía univóxel y la imágen de espectroscopía multivóxel obtenidas mediante bobina de cuadratura para la detección del carcinoma de próstata / Quadrature coils for magnetic resonance spectroscopy in the detection of prostate cancer: Single voxel acquisition does not improve the diagnostic accuracy of multivoxel images

Objetivo. Demostrar la viabilidad de la bobina de cuadratura para la detección del cáncer de próstata mediante espectroscopía univóxel e imágen multivóxel. Material y métodos. Se evaluaron 23 pacientes con sospecha de carcinoma de próstata, con niveles del antígeno especifico de próstata superior a 4ng/ml, (media 12±8ng/ml), independientemente del tacto rectal, estudiados en un equipo de RM de 1,5T con la bobina de cuadratura. Se adquirieron imágenes potenciadas en T2 e imágenes de espectroscopía. También se adquirieron estudios univóxel en aquellas zonas donde la imágen T2 o la imágen multivóxel estaban alteradas. Se realizó un control metodológico de espectroscopía con una disolución patrón de citrato. Resultados. Con la imágen espectroscópica y un punto de corte [(Co+Cr)/Cit] de 1,40 en el vóxel único se alcanzan unos valores de sensibilidad del 92%, especificidad del 55%, predictivo negativo del 86% y predictivo positivo del 69%. Con un punto de corte de 0,75, la especificidad disminuye discretamente (45%). La relación [(Co+Cr)/Cit] calculada para el volumen único obtenido del área más anormal en el T2 y en los cortes de espectroscopía multivóxel no mostró diferencias significativas entre tejidos no tumorales y carcinomas (ANOVA, p=0,1), aunque se observó una clara tendencia a aumentar el cociente con la hiperplasia y la degeneración neoplásica. Conclusión. La bobina de cuadratura permite obtener imágen multivóxel y espectros univóxel con una calidad técnica y clínicamente aceptables. El empleo de la espectroscopía univóxel no mejora la rentabilidad diagnóstica de la espectroscopía multivóxel y la imágen T2(AU)

Objective. To determine the viability of quadrature coils for detecting prostate cancer using single voxel and multivoxel spectroscopy images. Material and methods. We used a quadrature coil on a 1.5T MR scanner to evaluate 23 patients with suspected prostate cancer and prostate specific antigen levels greater than 4ng/ml (mean 12±8ng/ml), independently of findings at digital rectal examination. We acquired T2-weighted images and MR spectroscopy images. We also acquired single voxel studies in areas in which the T2-weighted images or the multivoxel images were altered. We used a citrate solution to verify the spectroscopic calibration. Results. Using spectroscopy images and a (Co+Cr)/Cit cutoff of 1.40 in single voxel spectroscopy, we achieved a sensitivity of 92%, specificity of 55%, a negative predictive value of 86%, and a positive predictive value of 69%. Using a cutoff of 0.75 decreased specificity slightly (45%). The (Co+Cr)/Cit ratio calculated for the single volume obtained from the most abnormal area in the T2-weighted images and in the multivoxel spectroscopy slices was not significantly different between cancerous and non-cancerous tissues (ANOVA, p=0.1), although there was a clear trend toward increased coefficients with hyperplasia and neoplastic degeneration. Conclusion. The quadrature coil enables multivoxel and single voxel spectroscopic images of clinically and technically acceptable quality to be obtained. Using single voxel spectroscopy does not improve the diagnostic performance of multivoxel spectroscopy and T2-weighted images(AU)

[Quadrature coils for magnetic resonance spectroscopy in the detection of prostate cancer: single voxel acquisition does not improve the diagnostic accuracy of multivoxel images]. / Complementariedad de la espectroscopía univóxel y la imágen de espectroscopía multivóxel obtenidas mediante bobina de cuadratura para la detección del carcinoma de próstata.

OBJECTIVE: To determine the viability of quadrature coils for detecting prostate cancer using single voxel and multivoxel spectroscopy images. MATERIAL AND METHODS: We used a quadrature coil on a 1.5T MR scanner to evaluate 23 patients with suspected prostate cancer and prostate specific antigen levels greater than 4ng/ml (mean 12±8ng/ml), independently of findings at digital rectal examination. We acquired T2-weighted images and MR spectroscopy images. We also acquired single voxel studies in areas in which the T2-weighted images or the multivoxel images were altered. We used a citrate solution to verify the spectroscopic calibration. RESULTS: Using spectroscopy images and a (Co+Cr)/Cit cutoff of 1.40 in single voxel spectroscopy, we achieved a sensitivity of 92%, specificity of 55%, a negative predictive value of 86%, and a positive predictive value of 69%. Using a cutoff of 0.75 decreased specificity slightly (45%). The (Co+Cr)/Cit ratio calculated for the single volume obtained from the most abnormal area in the T2-weighted images and in the multivoxel spectroscopy slices was not significantly different between cancerous and non-cancerous tissues (ANOVA, p=0.1), although there was a clear trend toward increased coefficients with hyperplasia and neoplastic degeneration. CONCLUSION: The quadrature coil enables multivoxel and single voxel spectroscopic images of clinically and technically acceptable quality to be obtained. Using single voxel spectroscopy does not improve the diagnostic performance of multivoxel spectroscopy and T2-weighted images.