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題 名 | 利用主觀與客觀方法評估電腦化放射攝影影像板對影像品質之改變=The Image Quality valuation by Means of Subjection and Objective Methods on Image Plate Reading |
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作 者 | 吳慧真; 王基誠; 黃俊肇; 陳素秋; 楊斐適; 林政勳; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 37:4 2013.12[民102.12] |
頁 次 | 頁222-227 |
分類號 | 416.12 |
關鍵詞 | 電腦化放射攝影; 影像板; 主觀目測分組評估; 客觀Moran I test品質參數評估; Computed radiography; Image plate; Visual grading analysis; Moran I test; |
語 文 | 中文(Chinese) |
中文摘要 | 探討電腦化放射攝影(Computed Radiography,CR)系統的影像板(image plate,IP板),使用次數與時間和不同攝影條件下的IP板,其影像衰退程度是否會造成影像品質的影響。藉以提供臨床在使用IP板多久時間後,必須汰換的依據。使用Philips Optimus 50搭配AGFA CR IP板(14×17inch),並使用四種不同部位假體(手部、肘關節、踝關節和腹部)臨床攝影條件,針對三種不同使用年份IP板(新購、15,000次和7年)分別進行照射,影像立即讀取後存檔,取得之CR影像後,進行影像分析,採主觀分析及客觀判定分別進行,分析主觀判定法邀請五位放射科專科醫師進行主觀目測分級評估(visual grading analysis) (VGA)根據良寙五等第評分;客觀判定法採用Moran I test品質參數評估分析其影像。主觀評估電腦化放射攝影影像板對影像品質之改變,結果顯示四種實驗假體手部p值分別為0.051、0.174、0.090;肘關節p值分別為0.061、0.083、0.069;踝關節p值分別為0.527、0.101、0.378;腹部p值分別為1.000、1.000、0.079皆p>0.05,統計結果發現並無顯著性的差異。而客觀評估電腦化放射攝影影像板對影像品質之改變,結果顯示影像板在使用7年之後,在影像上有差異,必須汰換。至於影像板在使用15,000次後,建議定期使用客觀方式評估影像品質,如果發現影像品質不佳,就必須汰換,以維持良好的影像品質。 |
英文摘要 | The advent of digital radiographic procedures has brought a revolutionary change to the radiographers daily performance. Traditional film-screen system is replaced by the advent of imaging plate (IP). The image quality is gradually decreased by repeatedly using IP or the life of that. However, how often being used or how old for IP could sacrifice image quality is key issue to be answered. The three IPs arc all AGFA ADC Compact Plus CR reader with MD 4.0 (14 x 17 inch). Three different part of human bones phantoms and a CIRS Model (CIRS 903 radiology QA phantom, USA) were radiographed with new purchased, 15,000 times of radiographies and seven years IPs respectively. Recorded images were respectively analyzed by using objective evaluation (Moran I test) and subjective evaluation (visual grading analysis, VGA) to understand the changes of image quality. Subjective evaluation shows no significant difference p >0.05 among three IPs at hand phantom p value 0.051, 0.174, 0.090; elbow phantom p value 0.061, 0.083, 0.069; ankle phantom p value 0.527, 0.101, 0.378; abdomen phantom p value 1.000, 1.000, 0.079. Lower image quality were found by means of objective evaluation, it suggests that IP after seven years should be replaced yet regularly test is suggested for IP being radiographed 15,000 times by Moran I test. Human visual ability is not sensitive to detect minor change of image quality, it should be carefully double checked by both subjective and objective evaluation to ensure image quality by different life of IPs. |
本系統中英文摘要資訊取自各篇刊載內容。