Diagnostic Value of Color Doppler Ultrasound Combined with Superb Microvascular Imaging in the Detection of Small Renal Tumors Less than 3 cm Treated with Jinkui Shenqi Pills

The purpose of this study was to investigate the diagnostic value of color Doppler ultrasound combined with superb microvascular imaging (SMI) in the detection of small renal tumors less than 3 cm treated with Jinkui Shenqi pills. 50 cases were randomly selected from the patients with angioleiomyoma (a kind of small renal tumor) less than 3 cm confirmed by pathological examination and treated in our hospital from January 2018 to January 2020. All patients were treated with Jinkui Shenqi pills. All patients were first detected by color Doppler ultrasound and then by SMI. The results of color Doppler ultrasound were used as the control group, while those of color Doppler ultrasound combined with SMI were used as the experimental group. After that, the specificity, sensitivity, positive and negative detection results, and detection accuracy were compared between the two groups. The specificity and sensitivity in the experimental group were significantly higher than those in the control group, with statistical significance (P < 0.05). The cases of positive and negative detection results in the experimental group were significantly higher than those in the control group, with statistical significance (P < 0.05). The detection accuracy in the experimental group was significantly higher than that in the control group, with statistical significance (P < 0.05). The specificity, sensitivity, positive and negative detection results, and detection accuracy of color Doppler ultrasound combined with SMI in the detection of small renal tumors less than 3 cm treated with Jinkui Shenqi pills were all significantly higher than those of color Doppler ultrasound; therefore, the application of color Doppler ultrasound combined with SMI for the diagnosis of small renal tumors is of high value.


Introduction
Small renal tumors including benign and malignant tumors are very common urinary diseases. e diameter of small renal tumors is generally no more than 3 cm at the early stage when the patients may not suffer from symptoms such as low back pain, odynuria, and hematuria, with little effect on their daily life. erefore, it is highly likely that the early diagnosis and treatment will be missed, resulting in the aggravation of the patients' conditions and seriously affecting patients' life health [1][2][3]. Jinkui Shenqi pills are a kind of Chinese traditional medicine (CTM) mainly to treat edema due to kidney deficiency, soreness and weakness of waist and knees, and other symptoms with the function of warming and invigorating kidney yang. e clinical symptoms of patients with small renal tumors can be alleviated to a certain extent after the treatment with Jinkui Shenqi pills. Color Doppler ultrasound is commonly used in the clinical diagnosis of small renal tumors. However, due to the small size of small renal tumors, the missed diagnosis and misdiagnosis may occur with single color Doppler ultrasound, adversely affecting patients' timely treatment [4][5][6]. Superb microvascular imaging (SMI) is a new type of imaging technology that detects human blood flow and displays the flow in a visual form, which can diagnose the vascular diseases of patients directly and accurately. It has been reported that the sensitivity and specificity of SMI in the detection and diagnosis of small renal tumors are relatively high, which can greatly improve the detection rate and accuracy of small renal tumors [7][8][9]. To further study the application value of color Doppler ultrasound combined with SMI in the diagnosis of small renal tumors, patients with small renal tumors were selected as the research objects to compare the specificity, sensitivity, positive and negative detection results, and detection accuracy between color Doppler ultrasound and SMI combined with color Doppler ultrasound, aiming to clarify the application value and diagnostic effect of color Doppler ultrasound combined with SMI in clinical practice, with details reported as below.

Materials and Methods
2.1. General Information. 50 cases were randomly selected from the patients with angioleiomyoma (a kind of small renal tumor) less than 3 cm confirmed by pathological examination and treated in our hospital from January 2018 to January 2020. All patients were first detected by color Doppler ultrasound and then by superb microvascular imaging (SMI). e results of color Doppler ultrasound were used as the control group, while those of color Doppler ultrasound combined with SMI were used as the experimental group. e patients were aged 22-69 years, with an average age of 46.22 ± 5.89 years, an average weight of 69.95 ± 4.70 kg, an average height of 168.82 ± 5.79 cm, and an average disease course of 3.20 ± 0.59 months.

Detection Methods.
All patients were first detected by color Doppler ultrasound and then by superb microvascular imaging (SMI). e results of color Doppler ultrasound were used as the control group, while those of color Doppler ultrasound combined with SMI were used as the experimental group. At 1 hour before detection, patients drank enough water to suppress urine and keep the bladder in a filling state. A color Doppler ultrasound detector (Toshiba Aplio 400 with the probe model as PLT-1005BT) was adopted. With patients taking supine positions during detection, the medical staff moved the probe to scan patients' kidney areas, with the probe frequency of 3.0-7.0 MHz, and recorded the location and size of lesions or tumors [10][11][12]. After the detection by color Doppler ultrasound, the detector was adjusted to the CDFI, PD, and ADF modes with the color SMI mode. When the patients held their breath, SMI scanning was performed with the lesions as the center and samples selected in the area of 1 cm around the lesions. After the adjustment of color gain and the disappearance of artifact without any factors affecting the diagnostic results, the microvessels were clearly visible to determine the diagnostic results.
In this study, the detection was performed, and the detection results were read by two attending physicians with more than 7 years of experience in abdominal ultrasound examination. If there were any differences, agreement would be reached after the results were discussed.

Treatment Methods. All patients orally took Jinkui
Shenqi pills (manufacturer: Pharmaceutical Factory of Beijing Tongrentang Technology Development Co., Ltd.; NMPA approval no. Z11020054) for treatment, with 20 pills each time for water-honey pills and 1 pill each time for big candied pills and 2 times a day.

Observation Indexes.
With the pathological examination results as the "gold standard," the specificity, sensitivity, positive and negative detection results, and detection accuracy were compared between the two groups.
Specificity � the cases of negative diagnostic results detected by color Doppler ultrasound/the cases of actual negative results detected by color Doppler ultrasound × 100%; sensitivity � the cases of positive diagnostic results detected by color Doppler ultrasound/the cases of actual positive results detected by color Doppler ultrasound × 100%; detection accuracy � the cases of both positive and negative results detected by color Doppler ultrasound and pathological diagnosis/the total number of patients × 100% [13][14][15].
All patients with positive results were detected twice. If the results were the same as those of the first detection, they were judged to be positive. If the results were different from those of the first detection, the patients were detected for the third time, and the third detection results were the final results.

Statistical Treatment.
e selected data processing software for this study was SPSS 20.0, and GraphPad Prism 7 (GraphPad Software, San Diego, USA) was used to draw the pictures of the data. Measurement data were expressed by (x ± s) and tested by t-test. Enumeration data were expressed as (n (%)) and tested by X 2 test. e differences had statistical significance when P < 0.05.

Comparison of Positive and Negative Detection Results between the Two Groups.
e cases of both positive and negative detection results in the experimental group (39 and 9 cases) were significantly more than those in the control group (21 and 2 cases), with statistical significance (P < 0.05), as shown in Table 1.

Comparison of Specificity and Sensitivity between the Two
Groups. Figure 1 shows the detection image of positive tumors in this study, and Figures 2 and 3 show the imaging images of negative tumors. e diagnostic specificity and sensitivity of the experimental group (90.00% and 97.50%) were significantly higher than those of the control group (18.18% and 53.85%), with statistical significance (P < 0.05), as shown in Table 2.

Comparison of Detection Accuracy between the Two Groups.
e detection accuracy in the experimental group (96%) was significantly higher than that in the control group (46%), with statistical significance (P < 0.05), as shown in

Discussion
Small renal tumors including benign and malignant tumors refer to intrarenal tumors less than 3 cm in diameter, and common benign tumors include angiomyolipoma [16][17][18][19]. Besides, malignant renal tumors, also known as renal cell carcinoma, commonly include Wilms' tumors and transitional cell carcinoma. Compared with benign renal tumors, renal cell carcinoma has lower incidence but poses a greater threat to patients' physical health. e infiltrative range, treatment, and prognosis of the tumors are closely related to the early diagnosis, and thus, exploring effective diagnostic methods has always been the focus in the research field of small renal tumors. All patients in this study were diagnosed with small renal tumors by pathological examination. e results of different detection methods showed that color Doppler ultrasound combined with SMI was more accurate, with higher specificity, sensitivity, and detection accuracy. e principle of SMI is to suppress blood vessels by clutter, so as to extract low-speed blood flow signals from blood vessels and express them as color overlaying images or monochromatic blood flow images. is shows that SMI can detect more blood flow signals and is more sensitive compared with color Doppler ultrasound. e results of this study showed that color Doppler ultrasound combined with SMI can obviously improve positive and negative detection rates. e specificity, sensitivity, and detection accuracy in the experimental group were significantly higher than those in the control group, with statistical significance (P < 0.05), indicating that color Doppler ultrasound combined with SMI can improve the diagnostic accuracy in patients with small renal tumors, which is worthy of application and popularization. Scholar Zhou et al. [20] pointed out in their study that color Doppler ultrasound combined with SMI could improve the positioning accuracy of the perforator Note. * indicated that the number of positive detection results was higher compared with the control group (P < 0.05). * * * indicated that the number of negative detection results was higher compared with the control group (P < 0.05).  Evidence-Based Complementary and Alternative Medicine flap artery in patients with diabetes, which is consistent with the conclusion and proves the scientificity of results in this study. At present, many scholars have affirmed the application value of color Doppler ultrasound in the diagnosis of small renal tumors in their research reports, but some clinical trials have revealed that the detection rate and accuracy of single color Doppler ultrasound for small renal tumors are not high, and its application effect remains unsatisfactory [21,22]. SMI is an imaging test that mainly targets at blood flow velocity in microvessels as well as blood flow classification. In this study, the combination of SMI and color Doppler ultrasound was applied to the diagnosis of renal small tumors, further exploring the diagnostic effect, diagnostic specificity, sensitivity, and detection accuracy. Although this study confirmed the diagnostic value of color Doppler ultrasound combined with SMI in the detection of small renal tumors less than 3 cm treated with Jinkui Shenqi pills, its diagnostic efficacy was not absolute. In clinical practice, it is necessary to combine the results of urine routine, blood biochemistry, and blood tumor markers to further improve the diagnostic accuracy of the disease.

Conclusions
In conclusion, the detection mode of small renal tumors by color Doppler ultrasound combined with SMI can significantly improve the specificity, sensitivity, and detection accuracy.
erefore, color Doppler ultrasound combined with SMI has high application value and significant diagnostic effect, which is worthy of application and popularization in clinical practice.

Data Availability
e datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.

Ethical Approval
is study was approved by the Ethics Committee of Yichang Traditional Chinese Medicine Hospital, China.

Consent
Signed written informed consent was obtained from the patients and/or guardians.

Conflicts of Interest
e authors declare that they have no conflicts of interest.

Authors' Contributions
YG designed the study and drafted the manuscript. SL was responsible for the collection and analysis of the experimental data. YG and SL revised the manuscript critically for important intellectual content. Both authors read and approved the final manuscript.  Note. * indicated a significant difference in the specificity between the two groups (P < 0.05). * * indicated a significant difference in the sensitivity between the two groups (P < 0.05).
Detection accuracy (%) * Note. e abscissa represented the experimental group and control group, while the ordinate represented detection accuracy (%). * denoted P < 0.05. * represented the comparison of detection accuracy between the two groups. e detection accuracy was 96% in the experimental group and 46% in the control group, with statistical significance (X 2 � 60.71 and P < 0.001). 4 Evidence-Based Complementary and Alternative Medicine