img2dcm: 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/img2dcm - from package: dcmtk

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

Error in other languages:
img2dcm: bevel nie gevind nie
img2dcm: comandă negăsită
img2dcm: comando não encontrado
img2dcm: commande introuvable
img2dcm: command not found
img2dcm: käsku ei ole
img2dcm: không tìm thấy lệnh
img2dcm: komanda nerasta
img2dcm: Kommando nicht gefunden.
img2dcm: kommandot finns inte
img2dcm: komut yok
img2dcm: nie znaleziono polecenia
img2dcm: níor aimsíodh an t-ordú
img2dcm: no se encontró la orden
img2dcm: no s'ha trobat l'ordre
img2dcm: opdracht niet gevonden
img2dcm: parancs nem található
img2dcm: perintah tidak ditemukan
img2dcm: príkaz nenájdený
img2dcm: příkaz nenalezen
img2dcm: команда не найдена
img2dcm: командата не е открита
img2dcm: 命令找不到
img2dcm: コマンドが見つかりません