Publication: Association between clinical parameters and venous access with the image quality of computed tomography pulmonary angiography (CTPA) in Hospital Universiti Sains Malaysia (Hospital USM)
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Date
2022
Authors
Mamat, Tengku Azran Raja
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Abstract
Objective This study aims to determine the association between clinical parameters and venous access with the objective and subjective image quality of computed tomography pulmonary angiography (CTPA). Materials and Methods One hundred patients were included in our study. Clinical parameters (gender, age, body weight, blood pressure, heart rate) were collected. The size and location of venous access were documented. Objective CTPA image quality assessment [pulmonary arterial enhancement (Objective PAenhan), signal to noise (SNR), contrast to noise ratio (CNR)] were measured. Two radiologists independently assessed subjective image quality. Results Positive linear relationship was demonstrated between age and objective PAenhan (p-value = 0.007, β = 0.251), SNR (p-value = 0.007, β = 0.251), CNR (p-value = 0.001, β = 0.301), and subjective image quality (P-value <0.000, β = 0.450). Negative linear relationship was shown between body weight and objective PAenhan (p-value <0.00, β = -0.473). SNR (p-value <0.00, β = -0.473), and CNR (p-value <0.000, β = -0.462). Higher subjective image quality was seen in male (mean = 3.782) compared to female (mean = 3.156) (p-value = 0001). Better subjective image quality was also seen in patients with IV cannula placed at the foot as opposed to hand (p-value = 0.02, 95% CI: 0.197, 3.153), or antecubital fossa (p = 0.04, 95% CI: 0.038, 2.839), and in patients with IV cannula at lower limb (mean = 4.400) as opposed to upper limb (mean = 3.347) (p-value = 0.014). There is no association between venous access and objective image quality. Conclusion Patient age and weight showed a significant impact on the image quality of CTPA. Blood pressure and heart rate did not significantly affect the image quality. Even though the males had statistically better subjective image quality than females, this might not be clinically significant due to minimal absolute difference.
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Keywords
Computed tomography pulmonary angiography , image quality