dctable: 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/dctable - from package: dicom3tools

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

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