不同重建方法和成像方式在提高CTU圖像質(zhì)量方面的應(yīng)用研究
發(fā)布時間：2019-05-29 05:12
【摘要】：研究背景與目的自泌尿系統(tǒng)CT成像(computed tomography urograpy,CTU)應(yīng)用于臨床日常工作以來,已替代靜脈腎盂造影(IVU)成為評估血尿患者病因的首要影像學檢查方法。然而傳統(tǒng)CTU排泄期高濃度碘對比劑所造成的硬化性偽影,對于泌尿系統(tǒng)自身解剖結(jié)構(gòu)及相關(guān)病灶的顯示,降低了對比劑周圍組織的清晰度,嚴重影響圖像質(zhì)量。故本研究從降低CTU硬化性偽影出發(fā),比較濾波反投影法(FBP)、自適應(yīng)統(tǒng)計迭代重建法(ASi R)、能譜單能量成像(85 ke V)及呋塞米改良法下的CTU圖像上腎盂、腎盞旁硬化性偽影的大小,探索不同成像技術(shù)及圖像重建方法在降低CTU硬化性偽影方面的作用,從而提高CTU圖像質(zhì)量。材料和方法:40例患者采用能譜GE Discovery CT750 HD(GE Healthcare)掃描儀,常規(guī)CTU動靜脈期、排泄期掃描,掃描結(jié)束后,切換成GSI掃描模式掃描排泄期,范圍均自膈頂至恥骨聯(lián)合下緣。對常規(guī)掃描模式下圖像選取排泄期數(shù)據(jù)分別采用FBP、ASIR30%重建,GSI掃描模式下選取85 Kev。數(shù)據(jù)重建厚度均為0.625 mm,將圖像傳至GE AW 4.51工作站。收集我院行小劑量呋塞米改良法CTU成像患者32例。32例小劑量呋塞米改良法:行小劑量呋塞米改良法掃描,結(jié)束后采用FBP重建,重建厚度0.625 mm,將圖像傳至GE AW 4.51工作站。對以上所取得圖像采用VR、MPR、MIP、CPR等方法行尿路成像后處理,圖像測量并比較腎盂、腎盞硬化性偽影較嚴重層面腎盞旁腎臟圖像的噪聲(SD)、信噪比(SNR)、對比噪聲比(CNR)、背景噪聲及腎盂、腎盞旁硬化性偽影(BHA)及輸尿管連續(xù)性相關(guān)主、客觀方面評分。結(jié)果1.腎盂、腎盞旁硬化性偽影主觀評分方面,傳統(tǒng)FBP組、傳統(tǒng)ASIR組、能譜組、改良組評分分別為1.30±0.46,1.40±0.49,2.53±0.50和2.81±0.47。2.傳統(tǒng)FBP組、傳統(tǒng)ASIR組、能譜組、改良組SD分別40.25±7.80,33.84±6.92,19.89±5.22,29.36±6.98,與傳統(tǒng)FBP比較,傳統(tǒng)ASIR組較其降低了約16%,能譜組降低約51%,改良組降低約27%。3.傳統(tǒng)FBP組、傳統(tǒng)AISR組、能譜組、改良組SNR分別約為3.88±0.77,4.69±0.94,5.51±1.21,6.88±2.02,與傳統(tǒng)FBP組比較,傳統(tǒng)ASIR組較其增加約21%,能譜組增加約42%,改良組增加約77%。4.傳統(tǒng)FBP組、傳統(tǒng)ASIR組、能譜組、改良組CNR分別為8.19±1.35,9.87±1.64,11.36±1.60,12.50±3.17,與傳統(tǒng)FBP組相比,傳統(tǒng)ASIR組較其增加約21%,能譜組增加約39%,改良組增加約53%。5.在輸尿管連續(xù)性評分方面,呋塞米改良組明顯優(yōu)于其他三組。結(jié)論:改良法降低CTU排泄期硬化性偽影效果最佳,其次是能譜成像。能譜成像能夠明顯提高圖像質(zhì)量。輸尿管連續(xù)性顯示改良法效果最佳。
[Abstract]:Background and objective since the application of urinary system CT imaging (computed tomography urograpy,CTU in clinical daily work, intravenous pyelography (IVU) has become the primary imaging method to evaluate the etiology of hematuria. However, the sclerosing artifacts caused by high concentration iodine contrast agent in the excretion stage of CTU reduce the clarity of the tissue around the contrast agent and seriously affect the image quality by displaying the anatomical structure of the urinary system and related lesions. Therefore, in order to reduce the sclerosing artifact of CTU, the filtering backprojection (FBP), adaptive statistical iterative reconstruction method (ASi R), energy spectrum single energy imaging (85 ke V) and furosemide modified CTU image on the renal pelvis) was compared in this study. To explore the role of different imaging techniques and image reconstruction methods in reducing CTU sclerosing artifacts, so as to improve the image quality of CTU. Materials and methods: 40 patients were scanned with energy spectrum GE Discovery CT750 HD (GE Healthcare) scanner, conventional CTU arteriovenous phase and excretion phase. After scanning, they were switched to GSI scanning mode, ranging from the phrenic apex to the inferior edge of pubic symphysis. The excretion period data were reconstructed by FBP,ASIR30% in conventional scanning mode and 85 Kev. in GSI scanning mode. The data reconstruction thickness is 0.625 mm, and the image is transmitted to GE AW 4.51 workstation. 32 patients with low dose furosemide modified CTU imaging in our hospital were collected. 32 patients with low dose furosemide modified method were scanned by low dose furosemide modified method. FBP reconstruction was performed at the end of the study. The reconstruction thickness was 0.625 mm,. Send the image to GE AW 4.51 workstation. VR,MPR,MIP,CPR and other methods were used for post-processing of urography. The noise (SD), signal-to-noise ratio (SNR) of renal pelvis and calyceal sclerosing artifacts were measured and compared with those of renal pelvis and calyceal sclerosing artifacts. The subjective and objective scores of background noise and renal pelvis, parachal sclerosing artifact (BHA) and Ureteral continuity were compared with (CNR), background noise and renal pelvis, parachal sclerosing artifact (BHA) and Ureteral continuity. Result 1. The scores of traditional FBP group, traditional ASIR group, energy spectrum group and improved group were 1.30 鹵0.46, 1.40 鹵0.49, 2.53 鹵0.50 and 2.81 鹵0.47.2, respectively. The SD of the traditional FBP group, the traditional ASIR group, the energy spectrum group and the improved group were 40.25 鹵7.80,33.84 鹵6.92, 19.89 鹵5.22 and 29.36 鹵6.98, respectively. Compared with the traditional FBP group, the traditional ASIR group decreased by about 16%, and the energy spectrum group decreased by about 51%. The improvement group decreased by about 27%. 3. The SNR of the traditional FBP group, the traditional AISR group, the energy spectrum group and the improved group were about 3.88 鹵0.77, 4.69 鹵0.94, 5.51 鹵1.21 and 6.88 鹵2.02, respectively. Compared with the traditional FBP group, the traditional ASIR group increased by about 21%, and the energy spectrum group increased by about 42%. The improvement group increased by about 77%. 4. The CNR of the traditional FBP group, the traditional ASIR group, the energy spectrum group and the improved group were 8.19 鹵1.35, 9.87 鹵1.64, 11.36 鹵1.60 and 12.50 鹵3.17, respectively. Compared with the traditional FBP group, the traditional ASIR group increased by about 21%, and the energy spectrum group increased by about 39%. The improvement group increased by about 53%. 5. 5%. In terms of ureter continuity score, furosemide modified group was significantly better than the other three groups. Conclusion: the improved method has the best effect on reducing sclerosing artifacts during excretion of CTU, followed by energy spectrum imaging. Energy spectrum imaging can obviously improve the image quality. The improved method has the best effect on the continuous display of ureter.
【學位授予單位】：安徽醫(yī)科大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：R816.7
[Abstract]:Background and objective since the application of urinary system CT imaging (computed tomography urograpy,CTU in clinical daily work, intravenous pyelography (IVU) has become the primary imaging method to evaluate the etiology of hematuria. However, the sclerosing artifacts caused by high concentration iodine contrast agent in the excretion stage of CTU reduce the clarity of the tissue around the contrast agent and seriously affect the image quality by displaying the anatomical structure of the urinary system and related lesions. Therefore, in order to reduce the sclerosing artifact of CTU, the filtering backprojection (FBP), adaptive statistical iterative reconstruction method (ASi R), energy spectrum single energy imaging (85 ke V) and furosemide modified CTU image on the renal pelvis) was compared in this study. To explore the role of different imaging techniques and image reconstruction methods in reducing CTU sclerosing artifacts, so as to improve the image quality of CTU. Materials and methods: 40 patients were scanned with energy spectrum GE Discovery CT750 HD (GE Healthcare) scanner, conventional CTU arteriovenous phase and excretion phase. After scanning, they were switched to GSI scanning mode, ranging from the phrenic apex to the inferior edge of pubic symphysis. The excretion period data were reconstructed by FBP,ASIR30% in conventional scanning mode and 85 Kev. in GSI scanning mode. The data reconstruction thickness is 0.625 mm, and the image is transmitted to GE AW 4.51 workstation. 32 patients with low dose furosemide modified CTU imaging in our hospital were collected. 32 patients with low dose furosemide modified method were scanned by low dose furosemide modified method. FBP reconstruction was performed at the end of the study. The reconstruction thickness was 0.625 mm,. Send the image to GE AW 4.51 workstation. VR,MPR,MIP,CPR and other methods were used for post-processing of urography. The noise (SD), signal-to-noise ratio (SNR) of renal pelvis and calyceal sclerosing artifacts were measured and compared with those of renal pelvis and calyceal sclerosing artifacts. The subjective and objective scores of background noise and renal pelvis, parachal sclerosing artifact (BHA) and Ureteral continuity were compared with (CNR), background noise and renal pelvis, parachal sclerosing artifact (BHA) and Ureteral continuity. Result 1. The scores of traditional FBP group, traditional ASIR group, energy spectrum group and improved group were 1.30 鹵0.46, 1.40 鹵0.49, 2.53 鹵0.50 and 2.81 鹵0.47.2, respectively. The SD of the traditional FBP group, the traditional ASIR group, the energy spectrum group and the improved group were 40.25 鹵7.80,33.84 鹵6.92, 19.89 鹵5.22 and 29.36 鹵6.98, respectively. Compared with the traditional FBP group, the traditional ASIR group decreased by about 16%, and the energy spectrum group decreased by about 51%. The improvement group decreased by about 27%. 3. The SNR of the traditional FBP group, the traditional AISR group, the energy spectrum group and the improved group were about 3.88 鹵0.77, 4.69 鹵0.94, 5.51 鹵1.21 and 6.88 鹵2.02, respectively. Compared with the traditional FBP group, the traditional ASIR group increased by about 21%, and the energy spectrum group increased by about 42%. The improvement group increased by about 77%. 4. The CNR of the traditional FBP group, the traditional ASIR group, the energy spectrum group and the improved group were 8.19 鹵1.35, 9.87 鹵1.64, 11.36 鹵1.60 and 12.50 鹵3.17, respectively. Compared with the traditional FBP group, the traditional ASIR group increased by about 21%, and the energy spectrum group increased by about 39%. The improvement group increased by about 53%. 5. 5%. In terms of ureter continuity score, furosemide modified group was significantly better than the other three groups. Conclusion: the improved method has the best effect on reducing sclerosing artifacts during excretion of CTU, followed by energy spectrum imaging. Energy spectrum imaging can obviously improve the image quality. The improved method has the best effect on the continuous display of ureter.
【學位授予單位】：安徽醫(yī)科大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：R816.7
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