Vectra 3D Imaging for Quantitative Volumetric Analysis of the Efficacy of Propranolol in Infantile Hemangioma

Infantile hemangioma (IH) is a common tumor in infants. After the proliferative phase, hemangiomas regress, but sometimes leave scars. Propranolol is now the recommended first-line oral therapy for IH. To evaluate the effectiveness of oral propranolol administration, we measured quantitative changes in an IH by digital camera and Computed Tomography (CT) or Magnetic Resonance Imaging (MRI). Although digital cameras are very simple, changes in color tones occur with time, lesions are evaluated in two dimensions, and changes in the thickness of the hemangioma are difficult to evaluate. Therefore, we investigated the feasibility of 3D photography to quantify volumes in IH during oral propranolol treatment.


Introduction
Infantile hemangiomas (IHs) rapidly increase in size from birth until 5 months of age [1]. After the proliferative phase, the color of most IHs fades and the size decreases. Because it takes a long time for the color of IHs to fade and residual lesions have a wrinkle-like appearance, it is sometimes necessary to surgically remove scars. The effectiveness of oral propranolol in the treatment of IHs was first reported in Europe in 2008 [2], and a global randomized control study was How to cite this paper: Kitabata, R., Aramaki-Hattori, N., Fukushima, H., Maeda, J., Kiuchi, T., Aoki, M. and Kishi, K. (2019) Vectra 3D Imaging for Quantitative Volumetric Analysis of the Efficacy of Propranolol in Infantile Hemangioma. Modern Plastic Surgery, 9, 45-51.
for IH. The oral administration of propranolol for treatment of IH has been covered by national insurance in Japan since 2017. Before national insurance approval, we offered this treatment in our hospital after review and approved by the Ethical Review Board of Keio University School of Medicine (approval code No. 20130027).
To evaluate the effectiveness of propranolol oral administration, we first measured quantitative changes in IHs by digital camera and CT or MRI. Although digital cameras are very simple, changes in color tones occur over time, lesions are evaluated in two dimensions, and changes in the thickness of IHs are difficult to evaluate. Because the indication was limited by expense and radiation exposure, there were many patients with superficial lesions who were ineligible, but there were several patients who were eligible, such as those with an IH in the orbital space or huge and deep IHs. To overcome the shortcomings, we used a 3D camera (Vectra ® H1; Canfield Scientific, Inc., NJ, USA) to measure quantitative changes in IHs. In this study, we determined whether or not 3D photography is a useful tool for measuring the surface area and volume of IHs over time during treatment.

Patients and Methods
This study included 10 patients treated with oral propranolol treatment from 2015-2016 in our hospital before propranolol treatment was covered by insurance in Japan. All IHs were in the proliferative phase and 3 months after. Oral propranolol treatment was provided for those who were expected to cause serious dysfunction such as respiratory and visual function or expected to have surgical resection after spontaneous regression, and for IHs in areas likely to be wedge-shaped (nose, lips, auricle, intercostal, etc.). The patients signed informed consult. Baseline screening by pediatric cardiologists included blood pressure, heart rate, hematologic examination, an echocardiogram, and an electrocardiogram. We initiated propranolol treatment in the hospital at a dose of 1 mg/kg per day and increased the dose to 2 mg/kg per day. After discharge from the hospital, we followed the patients in the outpatient clinic. We slowly tapered the 2 mg/kg per day dose after 6 months and stop the medication. 3D photographs of the IHs were taken using a 3D camera (Vectra ® H1) before starting the medication, and 1, 3, and 6 months after starting the medication). The Vectra H1 is a handy 3D camera system; the images are easy to analyze and the volume measurements are easy to obtain. Because the 3D camera system is designed to take pictures of people, the shooting time is 0.002 seconds, the color image is highly accurate, and background noise is suppressed. 3D reconstruction was generated using the attachment software for the 3D camera. The IH lesion outlines were manually traced to automatically calculate the surface area and volume.

Ethical Considerations
This study was reviewed and approved by the Ethical Review Board of Keio

Results
The average age at starting medication was 3.5 months. The study cohort consisted of 2 boys and 8 girls (Table 1). We calculated the IH surface area and volume at the start of treatment, and 1, 3, and 6 months after starting medication and followed up until three years old (1 case was lost to follow-up 1 month after starting medication and 2 cases were lost to follow-up 3 months after starting medication). The complication of treatments (hypotension, bradycardia, hypoglycemia, hyperkalemia, wheezing) does not occur. Case 1 was a 5-month-old boy. Two weeks after birth he developed an IH on the right chest and was referred to our hospital for oral treatment. Oral medication with a β-blocker was initiated at 2 mg/kg/day according to our protocol. 3D photographs of the IH were obtained before starting medication, and 1, 3, and 6 months after starting medication using a 3D camera (Vectra ® H1). A 3D image before starting medication is shown in Figure 1. By 6 months after starting medication, the color of the IH had faded, but it was difficult to determine the surface area and volume of the IH using a 2D digital camera (Figure 2(a) and Figure 2(b)). We simulated the chest wall using 3D photography from the 3D coordinates of the IH margin and calculated the volume of the IH (Figure 3(a)). The volume was 23.3 cc. Six months after starting oral administration, the volume of the IH was 5.4 cc ( Figure 3(b)). We also calculated the change in IH over time using the following formula: IH volume 1, 3, or 6 months after treatment (cc)/original IH volume (cc) × 100 (%). The volume of the IH lesion was significantly decreased during treatment (40.86% ± 17.19% at 1 month, 25.06% ± 14.41% at 3 months, and 8.69% ± 7.29% at 6 months; p < 0.001; Figure 4). The surface area of the IH was significantly decreased during treatment (82.23% ± 13.68% at 1 month, p < 0.01; 78.09% ± 28.79% at 3 months, p < 0.05; and 64.72% ± 22.36% at 6 months, p < 0.001; Figure 4). Case 2 is a 3-month-old girl. The change in IH over time is shown in Figure 5.

Discussion
A β-blocker has fewer side effects in treating IHs compared to steroids and interferon; especially good results have been reported in IHs involving the head and neck [5]. Although the mechanism of action of propranolol in treating IHs is not clear, propranolol is a non-selective beta-adrenergic antagonist with an affinity for β1 and β2 receptors. Propanolol causes down-regulation of bFGF and VEGF and induces apoptosis of capillary endothelial cells [6]. It has also been reported that propanolol selectively inhibits MMP-9 [6]. Propranolol has effica- Using a 3D camera (Vectra ® H1) is as easy as using a digital camera. Indeed, a 3D camera can easily measure the volume of IH lesions. 3D measurement is non-invasive, does not require radiation exposure and sedation as do CT and MRI, and is very useful in evaluating the treatment effect in infants. The reliability of 3D photography for IH volume changes over time (3 months after taking medication) has been reported [7]. Our study showed the volume and surface area changes in IHs by 6 months, as determined by 3D imaging. We should also consider the surface area. In case 3, a 4-month-old girl, even though no change in surface area was demonstrated, a decrease in volume was observed ( Figure 6). It is our opinion that quantitative evaluation of IHs using a 3D camera is useful.  Figure 1. 3D imaging of IH in a 5-month-old boy (movie). The chest wall is simulated from the 3D coordinates of the hemangioma margin, and the volume of the hemangioma present on it is calculated.   Although the surface area has not decreased, the volume has decreased by 80%. It shows the usefulness of the evaluation with a 3D camera. Figure 6. Changes in volume and surface area of IH during treatment in a 4-month-old girl. It shows that the surface area does not change much, but the volume is clearly reduced and improved with a 3D camera.
In this study, we followed infants for 6 months by using a 3D camera to measure the surface area and volume of IHs. The IH volume was shown to be greatly reduced with propranolol treatment compared with baseline. This result showed the usefulness of evaluation with a 3D camera. Even in cases in which the surface area did not change, the volume clearly decreased. A drawback of 3D imaging is that the shape of the lesion and simulation of the normal form may change and the camera is expensive. Nevertheless, we suggest that volumetric measurement of IHs using a 3D camera may be useful to evaluate treatment.

Conflicts of Interest
The authors declare no conflicts of interest regarding the publication of this paper.