ImageToDicom: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/ImageToDicom - from package: pixelmed-apps

You may install the required package with command apt-get install {package}

Error in other languages:
ImageToDicom: bevel nie gevind nie
ImageToDicom: comandă negăsită
ImageToDicom: comando não encontrado
ImageToDicom: commande introuvable
ImageToDicom: command not found
ImageToDicom: käsku ei ole
ImageToDicom: không tìm thấy lệnh
ImageToDicom: komanda nerasta
ImageToDicom: Kommando nicht gefunden.
ImageToDicom: kommandot finns inte
ImageToDicom: komut yok
ImageToDicom: nie znaleziono polecenia
ImageToDicom: níor aimsíodh an t-ordú
ImageToDicom: no se encontró la orden
ImageToDicom: no s'ha trobat l'ordre
ImageToDicom: opdracht niet gevonden
ImageToDicom: parancs nem található
ImageToDicom: perintah tidak ditemukan
ImageToDicom: príkaz nenájdený
ImageToDicom: příkaz nenalezen
ImageToDicom: команда не найдена
ImageToDicom: командата не е открита
ImageToDicom: 命令找不到
ImageToDicom: コマンドが見つかりません