Objective:to study the effect of automatic tube current modulation on abdominal CT image quality and radiation dose. Methods: a total of 70 patients who underwent abdominal CT examination in our hospital from August 2...Objective:to study the effect of automatic tube current modulation on abdominal CT image quality and radiation dose. Methods: a total of 70 patients who underwent abdominal CT examination in our hospital from August 2019 to August 2020 were collected and divided into control group (35 cases) and study group (35 cases) according to the random number table. CT scan was performed in the control group according to the conventional parameters, while CT scan was performed in the research group using automatic tube current modulation technology. The CT image quality and radiation dose of patients in the two groups were compared. Results: the image quality of the study group was better than that of the control group (P < 0.05). When NI ≥8, the radiation dose in the study group was lower than that in the control group (P < 0.05). Conclusion Automatic tube current modulation technique can obtain better image quality in CT detection, and has significant significance in reducing radiation dose. It is worthy of affirmation, praise and application.展开更多
AIM To compare radiation dose and image quality of lowdose computed tomography(CT) protocol combined with hybrid-iterative reconstruction algorithm with standarddose CT examinations for follow-up of oncologic patients...AIM To compare radiation dose and image quality of lowdose computed tomography(CT) protocol combined with hybrid-iterative reconstruction algorithm with standarddose CT examinations for follow-up of oncologic patients. METHODS Fifty-one patients with known malignant diseases which underwent, during clinical follow-up, both standarddose and low-dose whole-body CT scans were enrolled. Low-dose CT was performed on 256-row scanner, with 120 kV and automated m A modulation, and iterative reconstruction algorithm. Standard-dose CT was performed on 16-rows scanner, with 120 kV, 200-400 m As(depending on patient weight). We evaluated density values and signal-to-noise ratio, along with image noise(SD), sharpness and diagnostic quality with 4-point scale.RESULTS Density values in liver, spleen and aorta were higher in lowdose images(liver 112.55 HU vs 103.90 HU, P < 0.001), as SD values in liver and spleen(liver 16.81 vs 14.41). Volumetric-Computed-Tomographic-Dose-Index(CTDIvol) and Dose-Length-Product(DLP) were significantly lower in low-dose CT as compared to standard-dose(DLP 1025.6 m Gy*cm vs 1429.2 m Gy*cm, P < 0.001) with overall dose reduction of 28.9%. Qualitative analysis did not reveal significant differences in image noise and diagnostic quality.CONCLUSION Automatic tube-current modulation combined with hybriditerative algorithm allows radiation dose reduction of 28.9% without loss of diagnostic quality, being useful in reducing dose exposure in oncologic patients.展开更多
文摘Objective:to study the effect of automatic tube current modulation on abdominal CT image quality and radiation dose. Methods: a total of 70 patients who underwent abdominal CT examination in our hospital from August 2019 to August 2020 were collected and divided into control group (35 cases) and study group (35 cases) according to the random number table. CT scan was performed in the control group according to the conventional parameters, while CT scan was performed in the research group using automatic tube current modulation technology. The CT image quality and radiation dose of patients in the two groups were compared. Results: the image quality of the study group was better than that of the control group (P < 0.05). When NI ≥8, the radiation dose in the study group was lower than that in the control group (P < 0.05). Conclusion Automatic tube current modulation technique can obtain better image quality in CT detection, and has significant significance in reducing radiation dose. It is worthy of affirmation, praise and application.
文摘AIM To compare radiation dose and image quality of lowdose computed tomography(CT) protocol combined with hybrid-iterative reconstruction algorithm with standarddose CT examinations for follow-up of oncologic patients. METHODS Fifty-one patients with known malignant diseases which underwent, during clinical follow-up, both standarddose and low-dose whole-body CT scans were enrolled. Low-dose CT was performed on 256-row scanner, with 120 kV and automated m A modulation, and iterative reconstruction algorithm. Standard-dose CT was performed on 16-rows scanner, with 120 kV, 200-400 m As(depending on patient weight). We evaluated density values and signal-to-noise ratio, along with image noise(SD), sharpness and diagnostic quality with 4-point scale.RESULTS Density values in liver, spleen and aorta were higher in lowdose images(liver 112.55 HU vs 103.90 HU, P < 0.001), as SD values in liver and spleen(liver 16.81 vs 14.41). Volumetric-Computed-Tomographic-Dose-Index(CTDIvol) and Dose-Length-Product(DLP) were significantly lower in low-dose CT as compared to standard-dose(DLP 1025.6 m Gy*cm vs 1429.2 m Gy*cm, P < 0.001) with overall dose reduction of 28.9%. Qualitative analysis did not reveal significant differences in image noise and diagnostic quality.CONCLUSION Automatic tube-current modulation combined with hybriditerative algorithm allows radiation dose reduction of 28.9% without loss of diagnostic quality, being useful in reducing dose exposure in oncologic patients.
