**7. Conclusion and future work**

We developed an effective interface for reporting graphical findings in cardiac catheteriza‐ tion using hand-drawn diagrams. The user can easily record the position and degree of a stenosis on a coronary schema template, and can also record treatments such as bypasses and stents. Once a bypass is added, the system automatically displays the resumption of blood flow. This type of automatic adaptation is not possible with paper-based medical re‐ cords. Our system can store the data as a CAG table in an XML file in the AHA format for exchanging data with other existing systems. Our system makes it easier to handle graphical schemas in medical recording systems, encouraging the spread of medical recording sys‐ tems in general.

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Our system operates independently and does not require any other special infrastructure. Therefore, it can be easily introduced at low cost. We hope to put our system into actual clinical practice to make improvements based on feedback from actual users. We also plan to experiment with 3D schemas because 3D images are becoming increasingly widespread. We are also currently working with methods pertaining to 3D images. For example, Nakao et al. proposed a 3D cardiovascular modeling system based on neonatal echocardiographic images [15]. Using this system, medical doctors can interactively construct patient-specific cardiovascular models, and share the complex topology and shape information. Bo et al. in‐ troduced a lightweight sketching system that enables interactive illustration of complex flu‐ id systems [16]. Users can sketch on a 2.5D canvas to design the shapes and connections of a fluid circuit. Ijiri et al. developed an efficient and robust framework for simulating the car‐ diac beating motion [17]. The global cardiac motion is generated by the accumulation of lo‐ cal myocardial fiber contractions. They compute such local-to-global deformations using a kinematic approach, dividing a heart mesh model into overlapping local regions, contract‐ ing them independently according to fiber orientation, and computing a global shape that fits the contracted shapes of all local regions as well as possible.

The interactive graphical schemas introduced in this paper should be useful in not only car‐ diac catheterization but also other areas that use schemas, for example, ophthalmology, oto‐ laryngology, and dentistry. Such interactive schemas are useful not only for efficiently generating finding reports but also as an effective explanation tool for patients.
