dicom_echo: command not found

Have You tried accessing the binary with the full path?

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/dicom_echo - from package: ctn

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