The purpose of this study is to remove the shadow of cervical vertebrae from dental panoramic x-ray images with a tomosynthesis method and improve the contrast of details in both the teeth and jaw bones. To measure th...The purpose of this study is to remove the shadow of cervical vertebrae from dental panoramic x-ray images with a tomosynthesis method and improve the contrast of details in both the teeth and jaw bones. To measure the shift-amount at each angular position that was required for reconstruction of panoramic x-ray images of the dental arch, strip images of a calibration phantom were acquired. Then, a shift-amount table was prepared from these images, and the other shift-amount table, which was used to reconstruct a panoramic image of the cervical vertebrae, was prepared by inverting the curve of the shift-amount table upside down. Using these two tables, images focused on the dental arch and cervical vertebrae of a patient were made with the original strip data of the patient. The shadow of the cervical vertebrae appearing on the image focused on the dental arch was removed using the two above-mentioned images and blurring functions defined at two focusing geometries. The validity of the proposed method was evaluated with clinically acquired data of two patients. The shadow of the cervical vertebrae was successfully eliminated, and the contrast of the front teeth and detailed structures of the jaw bones was improved. The results of the experiments showed that our proposed method was significantly effective in removing the shadow of the cervical vertebrae from conventional panoramic x-ray images.展开更多
BACKGROUND Foreign body in the deep neck is mostly associated with accidental ingestion of the animal spiculate bone which penetrates the full-thickness of the aerodigestive tract into the fascial spaces of the neck.I...BACKGROUND Foreign body in the deep neck is mostly associated with accidental ingestion of the animal spiculate bone which penetrates the full-thickness of the aerodigestive tract into the fascial spaces of the neck.In general,perforation of the esophagus often results in periesophagitis and even fatal abscesses.The presence of a giant foreign body in the neck without obvious symptoms or complications for many years is rare.CASE SUMMARY We present the case of a 32-year-old man who intentionally swallowed a thermometer which was unable to be located by endoscopy at his initial visit.He had no remarkable symptoms for 5 years other than paresthesia and limited movement of the left neck until 7 d before this admission.The foreign body was removed successfully by the surgery.CONCLUSION The presence of a giant foreign body in the neck without obvious symptoms or complications for many years is rare.Both endoscopic and radiological examinations are essential for the diagnosis of alimentary foreign bodies.展开更多
文摘The purpose of this study is to remove the shadow of cervical vertebrae from dental panoramic x-ray images with a tomosynthesis method and improve the contrast of details in both the teeth and jaw bones. To measure the shift-amount at each angular position that was required for reconstruction of panoramic x-ray images of the dental arch, strip images of a calibration phantom were acquired. Then, a shift-amount table was prepared from these images, and the other shift-amount table, which was used to reconstruct a panoramic image of the cervical vertebrae, was prepared by inverting the curve of the shift-amount table upside down. Using these two tables, images focused on the dental arch and cervical vertebrae of a patient were made with the original strip data of the patient. The shadow of the cervical vertebrae appearing on the image focused on the dental arch was removed using the two above-mentioned images and blurring functions defined at two focusing geometries. The validity of the proposed method was evaluated with clinically acquired data of two patients. The shadow of the cervical vertebrae was successfully eliminated, and the contrast of the front teeth and detailed structures of the jaw bones was improved. The results of the experiments showed that our proposed method was significantly effective in removing the shadow of the cervical vertebrae from conventional panoramic x-ray images.
文摘BACKGROUND Foreign body in the deep neck is mostly associated with accidental ingestion of the animal spiculate bone which penetrates the full-thickness of the aerodigestive tract into the fascial spaces of the neck.In general,perforation of the esophagus often results in periesophagitis and even fatal abscesses.The presence of a giant foreign body in the neck without obvious symptoms or complications for many years is rare.CASE SUMMARY We present the case of a 32-year-old man who intentionally swallowed a thermometer which was unable to be located by endoscopy at his initial visit.He had no remarkable symptoms for 5 years other than paresthesia and limited movement of the left neck until 7 d before this admission.The foreign body was removed successfully by the surgery.CONCLUSION The presence of a giant foreign body in the neck without obvious symptoms or complications for many years is rare.Both endoscopic and radiological examinations are essential for the diagnosis of alimentary foreign bodies.
